Kursinnehåll

C# Basics

1. Getting Started

Why C#?C# Syntax Displaying Output Challenge: Outputting a Triangle Comments Challenge: Comments Variables Identifiers Challenge: Variable Declaration Basic Operators & Expressions Challenge: Operators

2. Dealing with Data Types

Integer Data Types Challenge: Declaring Explicitly Typed Variables Floating-Point and Double Booleans Character String Strings Challenge Basic String Formatting Challenge: String Formatting Declaring Constants Basic Type Casting Type Casting Practice Basic Type Conversion Basic Coding Practice

3. Control Structures

Comparison Operators Logical Operators Challenge: Operators Order of Operations If Statement Challenge: if Condition else Keyword Challenge: else Keyword if-else Chain Challenge: if, else-if, else switch Statement Challenge: Switch

4. Loops

for Loop Challenge: for Loop while Loop do-while Loop Challenge: do-while Loop break Statement continue Statement Challenge: break and continue

5. Arrays

What are Arrays?Challenge: Array Declaration Indexing Challenge: Indexing Multi-Dimensional Arrays Challenge: Multi-Dimensional Arrays Looping through Arrays Challenge: Array Loops

6. Methods

What are Methods?Creating and Calling Methods Challenge: Methods Creation Method Parameters Challenge: Method with Parameters Method Return Values Challenge: Return Values Local & Global Scopes Challenge: Scopes What's Next?

Comparison Operators

Before diving into control structures, we need to understand some operators. The first set of operators we will look at are called comparison operators.

As expressed by the name, the comparison operators are used for comparing values. Following is a list of all the comparison operators:

Using comparison operators we can create logical expressions that return logical values, such as true or false. For-example the expression 5 < 1 will output false as 5 is not greater than 1.

Note

We can directly put expressions in the Console.Write methods.

main


              123456789101112
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(5 < 1); // Output: False
        }
    }
}

Following are some more examples of expressions formed using comparison operators:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(1 == 2); // Output: False
			Console.WriteLine(2 == 2); // Output: True
			Console.WriteLine(5 < 10); // Output: True
			Console.WriteLine(5 < 5); // Output: False (5 is NOT less than 5)
			Console.WriteLine(5 <= 5); // Output: True
			Console.WriteLine(5 >= 5); // Output: True
			Console.WriteLine(7 != 9); // Output: True
        }
    }
}

We can also put variables in these expressions:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int value_1 = 7;
			int value_2 = 9;

			Console.WriteLine(value_1 == value_2); // Output: False
			Console.WriteLine(value_1 > value_2); // Output: False
			Console.WriteLine(value_1 < value_2); // Output: True
			Console.WriteLine(value_2 > 5); // Output: True
        }
    }
}

We can store the results of the logical expressions into bool variables since boolean variables can hold a value of true or false:

main


              12345678910111213141516
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int x = 5;
			int y = 7;

			bool result = x > y;
			Console.WriteLine(result); // Output: False
        }
    }
}

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 1

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Kursinnehåll

C# Basics

1. Getting Started

2. Dealing with Data Types

3. Control Structures

4. Loops

for Loop Challenge: for Loop while Loop do-while Loop Challenge: do-while Loop break Statement continue Statement Challenge: break and continue

5. Arrays

What are Arrays?Challenge: Array Declaration Indexing Challenge: Indexing Multi-Dimensional Arrays Challenge: Multi-Dimensional Arrays Looping through Arrays Challenge: Array Loops

6. Methods

Comparison Operators

Before diving into control structures, we need to understand some operators. The first set of operators we will look at are called comparison operators.

As expressed by the name, the comparison operators are used for comparing values. Following is a list of all the comparison operators:

Note

We can directly put expressions in the Console.Write methods.

main


              123456789101112
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(5 < 1); // Output: False
        }
    }
}

Following are some more examples of expressions formed using comparison operators:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(1 == 2); // Output: False
			Console.WriteLine(2 == 2); // Output: True
			Console.WriteLine(5 < 10); // Output: True
			Console.WriteLine(5 < 5); // Output: False (5 is NOT less than 5)
			Console.WriteLine(5 <= 5); // Output: True
			Console.WriteLine(5 >= 5); // Output: True
			Console.WriteLine(7 != 9); // Output: True
        }
    }
}

We can also put variables in these expressions:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int value_1 = 7;
			int value_2 = 9;

			Console.WriteLine(value_1 == value_2); // Output: False
			Console.WriteLine(value_1 > value_2); // Output: False
			Console.WriteLine(value_1 < value_2); // Output: True
			Console.WriteLine(value_2 > 5); // Output: True
        }
    }
}

We can store the results of the logical expressions into bool variables since boolean variables can hold a value of true or false:

main


              12345678910111213141516
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int x = 5;
			int y = 7;

			bool result = x > y;
			Console.WriteLine(result); // Output: False
        }
    }
}

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 1