Kurssisisältö

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?

Indexing

Every element of an array has an index which is simply its position in the array. The first element has the index 0, the second element has the index 1, and so on. Since indices start from 0, the last element's index is 1 less than the size of the array (size - 1).

The following illustration is a slightly modified version of the one from the last chapter however this time the elements have their corresponding indices written beneath them:

We can access an element of an array using the following syntax:

main.cs


              1
            
arrayName[index];

Let's consider the example of accessing the array element by it's index:

main.cs


              12345678910111213
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int[] studentMarks = new int[50];
			Console.WriteLine(studentMarks[9]); // Output: 0
        }
    }
}

In the above code, we access the 10th element of the array and it outputs 0. This is because when we create a new empty array it is automatically filled with relevant zero values according to its data type.

Each element of an array is essentially a variable.

We can access and modify an element of an array using the following syntax:

main.cs


              1
            
arrayName[index] = newValue;

For example:

main.cs


              1234567891011121314151617181920
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int[] studentMarks = new int[50];

			studentMarks[0] = 50;
			studentMarks[1] = 77;
			studentMarks[2] = 97;

			Console.WriteLine(studentMarks[0]);
			Console.WriteLine(studentMarks[1]);
			Console.WriteLine(studentMarks[2]);
        }
    }
}

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Osio 5. Luku 3

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Kurssisisältö

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

Indexing

The following illustration is a slightly modified version of the one from the last chapter however this time the elements have their corresponding indices written beneath them:

We can access an element of an array using the following syntax:

main.cs


              1
            
arrayName[index];

Let's consider the example of accessing the array element by it's index:

main.cs


              12345678910111213
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int[] studentMarks = new int[50];
			Console.WriteLine(studentMarks[9]); // Output: 0
        }
    }
}

Each element of an array is essentially a variable.

We can access and modify an element of an array using the following syntax:

main.cs


              1
            
arrayName[index] = newValue;

For example:

main.cs


              1234567891011121314151617181920
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int[] studentMarks = new int[50];

			studentMarks[0] = 50;
			studentMarks[1] = 77;
			studentMarks[2] = 97;

			Console.WriteLine(studentMarks[0]);
			Console.WriteLine(studentMarks[1]);
			Console.WriteLine(studentMarks[2]);
        }
    }
}

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 5. Luku 3