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# Introduction
The C# programming language is similar to any human written or spoken language.
They each support different ways of expressing the same idea. In spoken
languages, some words and phrases are more descriptive, accurate, or succinct
than others. In the C# programming language, there is more than one way to
create branching logic. For example, selections that use `if` statements and
selections that use `switch` statements. Depending on the context of your
application, one type of selection statement might be more expressive and
succinct than the other.
Suppose working on applications that make extensive use of selections
statements. In some cases, `if-elseif-else` constructs are used to produce
succinct and expressive code that is easy to read and maintain. In other cases,
the `if-elseif-else` constructs produce the required result, but are difficult
to read and maintain. You have been tasked with reviewing the code and
determining when it is suitable to use a `switch` statement rather than an `if`
statement.
In this module, you'll investigate the use of a `switch` statement to implement
branching logic as an alternative to an `if` statement. You'll also work on
converting an `if-elseif-else` construct to a `switch-case` construct. During
this process, you'll learn to recognize the benefits of choosing one type of
selection statement over the other.
By the end of this module, you'll be able to implement `switch` statements in
your application, judge when to use a `switch` statement over an
`if-elseif-else` construct, and convert `if-elseif-else` constructs to `switch`
statements.
### Learning objectives
In this module, you will:
- Use the `switch-case` construct to match a variable or expression against
several possible outcomes.
- Convert code that uses an `if-elseif-else` construct into a `switch-case`
construct.
---
## Exercise
### Implement a switch statement
A `switch` statement is a C# selection statement that provides an alternative
to an `if-elseif-else` branching construct. The `switch` statement provides
advantages over an `if-elseif-else` construct when evaluating a single value
against a list of known matching values.
Consider the following scenario:
- You're working on an application related to food nutrition. A section of the
code deals with fruits.
- Your code includes a variable named `fruit` that's used to hold the name of
different types of fruit.
- You have a list of the 20 fruits that your application is focused on.
- You want to branch your code based on the value assigned to `fruit`.
In this scenario, you can use a `switch` statement to create a separate branch
for each type of fruit.
### How does a switch statement work?
The `switch` statement chooses one section of code to execute from a list of
possible switch sections. The selected switch section is chosen based on a
pattern match with the statement's match expression.
Consider the following code sample that shows the basic structure of `switch`
statement:
```cs
switch (fruit) {
case "apple":
Console.WriteLine($"App will display information for apple.");
break;
case "banana":
Console.WriteLine($"App will display information for banana.");
break;
case "cherry":
Console.WriteLine($"App will display information for cherry.");
break;
}
```
The match expression (which may also be referred to as the switch expression)
is the value following the `switch` keyword, in this case (`fruit`). Each
*switch* section is defined by a *case pattern*. Case patterns are constructed
using the keyword `case` followed by a value. The first case pattern in this
example is: `case "apple":`. Case patterns are Boolean expressions that
evaluate to either `true` or `false`. Each switch section includes a small
number of code lines that will be executed if the case pattern is a match for
the match expression. In this example, if `fruit` is assigned a value of
"apple", the first case pattern will evaluate as `true` and that switch section
will be executed.
A switch statement must include at least one switch section, but will normally
contain three or more switch sections.
The switch is best used when:
- You have a single value (variable or expression) that you want to match
against many possible values.
- For any given match, you need to execute a couple of lines of code at most.
> Note
> This first example of a `switch` statement is purposefully simple and your
examination of the syntax was brief. You will be examining additional features
of the `switch` statement when you work through some more advanced scenarios
in the sections below.
It's time to prepare your coding environment and begin developing your own
`switch` statements.
#### Prepare your coding environment
At the Terminal command prompt, to create a new console application in a
specified folder, type dotnet new console -o ./path_to/TestProject and then
press Enter.
This .NET CLI command uses a .NET program template to create a new C# console
application project in the specified folder location.
#### Create and test a switch statement
Type the following code into the editor:
```cs
int employeeLevel = 200;
string employeeName = "John Smith";
string title = "";
switch (employeeLevel) {
case 100:
title = "Junior Associate";
break;
case 200:
title = "Senior Associate";
break;
case 300:
title = "Manager";
break;
case 400:
title = "Senior Manager";
break;
default:
title = "Associate";
break;
}
Console.WriteLine($"{employeeName}, {title}");
```
The Program.cs file must be saved before building or running the code.
At the Terminal command prompt, to run your code, type `dotnet run` and then
press Enter.
Output

```txt
John Smith, Senior Associate
```
Take a minute to review the `switch` statement that you entered.
Notice that the `switch` statement defines a single code block.
The `switch` statement defines a single code block that includes a list of
`switch` sections. To the right of the switch keyword is a *switch expression*
that's enclosed in parentheses.
Notice the list of switch sections inside the code block.
The `switch` code block contains a list of switch sections, each of which
includes one or more switch labels. In addition, each switch section includes
a statement list that will execute if the label is equal to the switch
expression defined at the top of the switch statement.
The switch expression is evaluated against the case labels from top to bottom
until a value that is equal to the switch expression is found. If none of the
labels are a match, the statement list for the `default` case will be executed.
If no default is included, control is transferred to the end point of the
switch statement. Each label must provide a value type that matches the type
specified in the switch expression.
> Note
> The optional `default` label can appear at any position within the list of
switch sections. However, most developers choose to put it last because it
makes more sense (logically) to position `default` as the final option.
Regardless of the position, the `default` section will be evaluated last.
In our example:
- the switch expression is `(employeeLevel)`
- each switch section has a single switch label (`case` or `default`).
- the matching switch section is defined by `case: 200`, since
`employeeLevel = 200`.
Notice that each switch section is separated from the next.
Only one switch section is allowed to be executed. This means that execution
of a switch section is not permitted to “fall through” to the next switch
section. The `break` keyword is one of several ways to end a switch section
before it gets to the next section. If you forget the `break` keyword (or,
optionally, the `return` keyword) the compiler will generate an error.
#### Change the level variable value to see how the switch statement evaluates it
To exercise the default case, let's change the employee's level by modifying the value assignment.
To modify the value assigned to `employeeLevel`, update your code as follows:
```cs
int employeeLevel = 201;
```
Save your code file, and then run your code.
Enter `dotnet run` from the Terminal command prompt to run your code.
Notice that the output has changed.
Now, when you run the code, you should see the more generic title used.
```txt
John Smith, Associate
```
Since the `employeeLevel` doesn't match any labels, the `default` label is
matched.
#### Modify a switch section to include multiple labels
Suppose our company decided to give all level 100 employees the title "Senior
Associate" -- the same title as level 200 employees. As the developer, you
decide to implement this by removing the first switch section belonging to the
label `case 100:`, and instead allow both the `case 100:` and `case 200:` labels
to execute the same switch section.
To modify the value assigned to employeeLevel, update your code as follows:
```cs
int employeeLevel = 100;
```
To assign multiple labels to the first switch section, update your code as follows:
```cs
case 100:
case 200:
title = "Senior Associate";
break;
```
When you're finished making changes, your modifications should match the
following code:
```cs
int employeeLevel = 100;
string employeeName = "John Smith";
string title = "";
switch (employeeLevel) {
case 100:
case 200:
title = "Senior Associate";
break;
case 300:
title = "Manager";
break;
case 400:
title = "Senior Manager";
break;
default:
title = "Associate";
break;
}
Console.WriteLine($"{employeeName}, {title}");
```
Save your code file, and then run your code.
Enter `dotnet run` from the Terminal command prompt to run your code.
You should see the following output:
```txt
John Smith, Senior Associate
```
Both of the case labels `100` and `200` are now paired with the switch section
that sets the title to the string value `Senior Associate`.
### Recap
Here's the main takeaways you learned about the switch statement:
- Use the `switch` statement when you have one value with many possible matche
s, each match requiring a branch in your code logic.
- A single switch section containing code logic can be matched using one or
more labels defined by the `case` keyword.
- Use the optional `default` keyword to create a label and a switch section
that will be used when no other case labels match.
---
## Exercise
### Complete a challenge activity using switch statements
Code challenges will reinforce what you've learned, and help you gain some
confidence before continuing on.
### Convert to switch statements challenge
In this challenge, you'll rewrite an `if-elseif-else` construct as a `switch`
statement. This challenge should help you see the strengths/weaknesses of the
`switch` statement when compared to an `if-elseif-else` construct. Good luck.
### Code challenge: rewrite if-elseif-else using a switch statement
You'll start with code that uses an `if-elseif-else` construct to evaluate the
components of a product SKU. The SKU (Stock Keeping Unit) is formatted using
three coded values: `<product #>-<2-letter color code>-<size code>`. For
example, a SKU value of `01-MN-L` corresponds to (sweat shirt)-(maroon)-(large),
and the code outputs a description that appears as "Product: Large Maroon
Sweat shirt".
Your challenge is to convert the `if` statement code to a `switch` statement
that achieves the same result as the initial code.
Enter the following code into the code editor:
```cs
// SKU = Stock Keeping Unit.
// SKU value format: <product #>-<2-letter color code>-<size code>
string sku = "01-MN-L";
string[] product = sku.Split('-');
string type = "";
string color = "";
string size = "";
if (product[0] == "01") {
type = "Sweat shirt";
} else if (product[0] == "02") {
type = "T-Shirt";
} else if (product[0] == "03") {
type = "Sweat pants";
} else {
type = "Other";
}
if (product[1] == "BL") {
color = "Black";
} else if (product[1] == "MN") {
color = "Maroon";
} else {
color = "White";
}
if (product[2] == "S") {
size = "Small";
} else if (product[2] == "M") {
size = "Medium";
} else if (product[2] == "L") {
size = "Large";
} else {
size = "One Size Fits All";
}
Console.WriteLine($"Product: {size} {color} {type}");
```
Update the code to use a `switch` statement in place of the `if-elseif-else`
construct.
Verify that your output hasn't changed.
No matter how you do it, your code should produce the following output:
Output

```txt
Product: Large Maroon Sweat shirt
```
```cs
string sku = "01-MN-L";
string[] product = sku.Split('-');
string type = "";
string color = "";
string size = "";
switch (product[0]) {
case "01":
type = "Sweat shirt";
break;
case "02":
type = "T-Shirt";
break;
case "03":
type = "Sweat pants";
break;
default:
type = "Other";
break;
}
switch (product[1]) {
case "BL":
color = "Black";
break;
case "MN":
color = "Maroon";
break;
default:
color = "White";
break;
}
switch (product[2]) {
case "S":
size = "Small";
break;
case "M":
size = "Medium";
break;
case "L":
size = "Large";
break;
default:
size = "One Size Fits All";
break;
}
Console.WriteLine($"Product: {size} {color} {type}");
```

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// SKU = Stock Keeping Unit.
// SKU value format: <product #>-<2-letter color code>-<size code>
string sku = "01-MN-L";
string[] product = sku.Split('-');
string type = "";
string color = "";
string size = "";
switch (product[0]) {
case "01":
type = "Sweat shirt";
break;
case "02":
type = "T-Shirt";
break;
case "03":
type = "Sweat pants";
break;
default:
type = "Other";
break;
}
switch (product[1]) {
case "BL":
color = "Black";
break;
case "MN":
color = "Maroon";
break;
default:
color = "White";
break;
}
switch (product[2]) {
case "S":
size = "Small";
break;
case "M":
size = "Medium";
break;
case "L":
size = "Large";
break;
default:
size = "One Size Fits All";
break;
}
Console.WriteLine($"Product: {size} {color} {type}");

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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# Iterate through a code block using for statement in C#
Use the for iteration statement to loop a pre-set number of times and control the iteration process.
### Learning objectives
After you complete this module, you'll be able to:
- Use the `for` statement to loop through a block of code
- Modify how the .NET Runtime executes the looping logic, changing the value
of the iterator, the condition and the pattern
## Introduction
There are several ways to add looping logic in your application, and depending
on the context, each provides a nuanced set of features that have both pros
and cons.
Suppose you're about to start working on an application that processes string
and numeric data using single dimensional and multidimensional arrays. After
an initial review, you realize that `foreach` statements do not support
looping logic that will be required in many cases. You'll need another
approach for iterating through multidimensional arrays, and for situations
where `foreach` loops don't provide the level of iteration control that's
needed. You need to gain experience using `for` statements if you're going to
succeed on this project.
In this module, you'll begin by writing `for` statements that iterate a
specific number of times. After implementing a basic `for` statement, you'll
learn how to implement `for` statements that iterate backwards through an array,
skip over array elements during an iteration, or process only specified
elements of an array (by changing the `for` statement's initializer, condition,
and iterator).
By the end of this module, you'll be able to use `for` statements to implement
looping logic when foreach statements don't support the scenario.
---
## Exercise
### Create and configure for iteration loops
On the surface, the `for` statement is another iteration statement that allows
you to iterate through a code block and thereby change the flow of execution
of your code. However, once we examine how each works, we can better identify
the nuances of each iteration statement and when to use them.
### What is the `for` statement?
The `for` statement iterates through a code block a specific number of times.
This level of control makes the `for` statement unique among the other
iteration statements. The `foreach` statement iterates through a block of code
once for each item in a sequence of data like an array or collection. The
`while` statement iterates through a block of code until a condition is met.
Furthermore, the `for` statement gives you much more control over the process
of iteration by exposing the conditions for iteration.
In this exercise, you'll use the `for` statement, learning how to control the
iteration's pre-condition, completion condition, its iteration pattern and more.
Also, you'll learn of common use cases for the `for` statement.
Okay, now let's prepare our coding environment and begin our examination of
code samples that implement a `for` statement.
#### Prepare your coding environment
At the Terminal command prompt, to create a new console application in a
specified folder, type "dotnet new console -o ./path_to/TestProject" and then
press Enter.
This .NET CLI command uses a .NET program template to create a new C# console
application project in the specified folder location.
### Write a basic for statement
Ensure that you have Program.cs open in the code editor.
> Note
> Program.cs should be empty. If if isn't, select and delete all code lines.
Type the following code into the code editor.
```cs
for (int i = 0; i < 10; i++) {
Console.WriteLine(i);
}
```
This code presents a simple `for` statement that loops through its code block 10
times, printing the current value of `i`.
The Program.cs file must be saved before building or running the code.
At the Terminal command prompt, to run your code, type `dotnet run` and then
press Enter.
You should see the following output.
```txt
0
1
2
3
4
5
6
7
8
9
```
Take a minute to identify the six parts of the `for` statement.
The `for` statement includes the following six parts:
1. The `for` keyword.
2. A set of parentheses that defines the conditions of `for` iteration. The
parentheses contain three distinct parts, separated by the end of statement
operator, a semi-colon.
3. The first part defines and initializes the iterator variable. In this
example: `int i = 0`. This section is referred to as the initializer.
4. The second part defines the completion condition. In this example: `i < 10`.
In other words, the runtime will continue to iterate over the code in the code
block below the `for` statement while `i` is less than `10`. When `i` becomes
equal to `10`, the runtime stops executing the `for` statement's code block. The
docs refer to this section as the condition.
5. The third part defines the action to take after each iteration. In this case,
after each iteration, `i++` will increment the value of `i` by 1. The docs
refer to this section as the **iterator**.
6. Finally, the code block. The code block contains the code that will be
executed for each iteration. Notice that the value of `i` is referenced inside
of the code block. The docs refer to this section as the body.
Given our rules for naming variables, you may wonder if `i` is a valid name
for the variable that holds the current iteration. In this case, `i` is
considered by most to be valid. Other popular choices are `x` and `counter`.
The name `j` is also used in those situations when you have an outer `for`
statement that uses `i`, and need to create an iteration variable for an inner
`for` statement.
> Note
> All three sections (initializer, condition, and iterator) are optional.
However, in practice, typically all three sections are used.
### Change the iteration conditions
As we stated at the outset, the `for` statement has two unique qualities among
iteration statements.
- The `for` statement should be used when you know the number of times you
need to iterate through a block of code ahead of time.
- The `for` statement allows you to control the way in which each iteration is
handled.
What if we needed to iterate through a block of code, but want to count down instead of counting up?
Update your code as follows:
```cs
for (int i = 10; i >= 0; i--) {
Console.WriteLine(i);
}
```
Take a minute to review your updated code.
By changing the three parts of the `for` statement, we change its behavior.
- We initialize the iteration variable to 10.
- We change the completion condition to exit the `for` statement when `i` is
less than `0`.
- We change the pattern of the iterator to subtract `1` from `i` each time we
complete an iteration.
Save your code file, and then run your code.
Enter `dotnet run` from the Terminal command prompt to run your code.
Notice that the output has changed.
When you run the code, you'll see the following output.
```txt
10
9
8
7
6
5
4
3
2
1
0
```
### Experiment with the iterator's pattern
What if we wanted to skip past certain values in the iterator variable?
Use the code editor to update your code as follows:
```cs
for (int i = 0; i < 10; i += 3) {
Console.WriteLine(i);
}
```
Take a minute to review your updated code.
Instead of incrementing or decrementing the value of the iterator variable by
`1`, we use `i += 3` to skip two values after each iteration.
Save your code file, and then use run your code.
Enter `dotnet run` from the Terminal command prompt to run your code.
Notice how the output has changed.
When you run the code, you'll see the following output.
```txt
0
3
6
9
```
Admittedly, you won't do this sort of thing often, but hopefully you can
appreciate that you have a fine grained level of control over the iterations
should you ever need it.
### Use the break keyword to break the iteration statement
What if we need to exit the iteration statement prematurely based on some
condition? We can use the `break` keyword.
Use the code editor to update your code as follows:
```cs
for (int i = 0; i < 10; i++) {
Console.WriteLine(i);
if (i == 7) break;
}
```
Take a minute to review the use of the `break` keyword in your updated code.
We first saw the `break` keyword in the module "Branch the flow of code using
the switch-case construct in C#". As it turns out, we can use the `break`
keyword to exit out of iteration statements as well.
Save your code file, and then run your code.
When you run the code, you'll see the following output.
```txt
0
1
2
3
4
5
6
7
```
### Loop through each element of an array
A common usage `for` the for statement is to iterate through an array of
elements, especially if you need some control over the manner in which the
iteration happens. While the `foreach` iterates through every element of the
array, the for statement can be tweaked to provide more customization.
Update your code as follows:
```cs
string[] names = { "Alex", "Eddie", "David", "Michael" };
for (int i = names.Length - 1; i >= 0; i--) {
Console.WriteLine(names[i]);
}
```
Take a minute to review your updated code.
First off, notice that we have instantiated a string array named `names` that
contains four names.
Next, notice that we are using the `Array.Length` property to get the number
of elements in the array, and that we are using this value to initialize our
iterator variable (`int i = names.Length - 1`). We subtract 1 from the value
because the index number for array elements is zero-based (the index numbers
of the four elements are 0-3).
Finally, notice we have chosen iterate through the array backwards--something
that we are unable to do with the `foreach` statement. We use the value of the
iteration variable inside the code block to specify the index number of the
array elements (`names[i]`).
Save your code file, and then enter `dotnet run` from the Terminal command
prompt to run your code.
Output

```txt
Michael
David
Eddie
Alex
```
> Note
> We could have iterated forward through the array elements by constructing
the `for` statement as follows: `for (int i = 0; i < names.Length; i++)`.
### Examine the limitation of the foreach statement
What if you want to update a value in the array during a `foreach` iteration?
Use the Visual Studio Code Editor to update your code as follows:
```cs
string[] names = { "Alex", "Eddie", "David", "Michael" };
foreach (var name in names) {
// Can't do this:
if (name == "David") name = "Sammy";
}
```
Save your code file, and then enter `dotnet run` from the Terminal command
prompt to run your code.
Notice the error message that is displayed.
If you attempt to compile and run this code, you will see an exception.
```txt
Cannot assign to name because it is a 'foreach iteration variable'
```
In other words, you can't reassign the value of `name` because it is part of
the `foreach` iteration's inner implementation.
### Overcoming the limitation of the foreach statement using the for statement
Let's try using a `for` statement to modify the contents of an array inside
the iteration code block.
Use the code editor to update your code as follows:
```cs
string[] names = { "Alex", "Eddie", "David", "Michael" };
for (int i = 0; i < names.Length; i++)
if (names[i] == "David") names[i] = "Sammy";
foreach (var name in names) Console.WriteLine(name);
```
Take a minute to review your updated code.
Notice that we removed the curly braces from the code blocks that contained
only a single line of code. This revision uses the same technique that we
talked about in the module "Control variable scope and logic using code blocks
in C#". Many developers find this style difficult to read, while others prefer
this abbreviated style because it helps them write more succinctly and more
expressively. If you find this code difficult to read, or if you just don't
prefer this style, rest assured that the curly braces can always be used in
your code blocks. If you want, update the code in the Editor panel with the
following code:
```cs
string[] names = { "Alex", "Eddie", "David", "Michael" };
for (int i = 0; i < names.Length; i++) {
if (names[i] == "David") {
names[i] = "Sammy";
}
}
foreach (var name in names) {
Console.WriteLine(name);
}
```
Save your code file, and then enter `dotnet run` from the Terminal command
prompt to run your code.
Notice that the code runs without error and generates the desired output.
When you run the code, you'll see the following output.
```txt
Alex
Eddie
Sammy
Michael
```
Since the array isn't directly part of the iteration statement's implementation,
you can change values inside of the array.
### Recap
Here are a few of the takeaways from this unit:
- The `for` iteration statement allows you to iterate through a block of code a
specific number of times.
- The `for` iteration statement allows you to control every aspect of the
iteration's mechanics by altering the three conditions inside the parentheses:
the initializer, condition, and iterator.
- It's common to use the `for` statement when you need to control how you want
to iterate through each item in an array.
- If your code block has only one line of code, you can eliminate the curly
braces and white space if you wish.
---
## Exercise
### Complete a challenge activity using for and if statements
Code challenges will reinforce what you've learned and help you gain some
confidence before continuing on.
### FizzBuzz challenge
FizzBuzz is a popular coding challenge and interview question. It exercises
your understanding of the `for` statement, the `if` statement, the `%`
remainder operator, and your command of basic logic.
### Code challenge - implement the FizzBuzz challenge rules
Here are the FizzBuzz rules that you need to implement in your code project:
- Output values from 1 to 100, one number per line, inside the code block of
an iteration statement.
- When the current value is divisible by 3, print the term `Fizz` next to the
number.
- When the current value is divisible by 5, print the term `Buzz` next to the
number.
- When the current value is divisible by both 3 and 5, print the term `FizzBuzz`
next to the number.
Write the code that implements each rule.
> Important
> You will need to understand how to use the `%` remainder operator to determine
if a number is divisible by another number evenly. We covered this in the
module "Perform basic operations on numbers in C#".
Run your application and verify that your output meets the requirements.
No matter how you have nested you iteration and conditional statements, your
code should produce the following output.
```txt
1
2
3 - Fizz
4
5 - Buzz
6 - Fizz
7
8
9 - Fizz
10 - Buzz
11
12 - Fizz
13
14
15 - FizzBuzz
16
17
18 - Fizz
19
20 - Buzz
21 - Fizz
22
.
.
.
```
> Note
> We only show the first 22 values, but your output should continue to 100. As
you can see, the number `15` is divisible by both 3 and 5, so we print
`FizzBuzz` next to that number.
```cs
for (int i = 1; i <= 100; i++) {
string output = "";
if (i%3 == 0) {
output += "Fizz";
}
if (i%5 == 0) {
output += "Buzz";
}
Console.WriteLine($"{i} {output}");
}
```
---

22
016_Iterate_using_for_statement/fizzbuzz/Program.cs Normal file
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@ -0,0 +1,22 @@
for (int i = 1; i <= 100; i++) {
string output = "";
if (i%3 == 0) {
output += "Fizz";
}
if (i%5 == 0) {
output += "Buzz";
}
Console.WriteLine($"{i} {output}");
}
// suggested solution
// for (int i = 1; i < 101; i++) {
// if ((i % 3 == 0) && (i % 5 == 0))
// Console.WriteLine($"{i} - FizzBuzz");
// else if (i % 3 == 0)
// Console.WriteLine($"{i} - Fizz");
// else if (i % 5 == 0)
// Console.WriteLine($"{i} - Buzz");
// else
// Console.WriteLine($"{i}");
// }

10
016_Iterate_using_for_statement/fizzbuzz/fizzbuzz.csproj Normal file
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@ -0,0 +1,10 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

4
README.md
View File

@ -17,3 +17,7 @@ Following
- [Conventions](./010_conventions/010_csharp.md) - [Conventions](./010_conventions/010_csharp.md)
- [Guided Project - foreach](./011_foreach_array_1/011_csharp.md) - [Guided Project - foreach](./011_foreach_array_1/011_csharp.md)
- [Challenge Project - foreach](./012_foreach_array_2/012_csharp.md) - [Challenge Project - foreach](./012_foreach_array_2/012_csharp.md)
- [Evaluate Boolean expressions](/013_eval_boolean_expressions/013_csharp.md)
- [Control variable scope and logic](/014_scope_and_logic/014_csharp.md)
- [switch case construct](./015_switch_case/015_csharp.md)
- [switch case construct](/016_Iterate_using_for_statement/016_csharp.md)