C# 02 — String methods, For loop, Array, Foreach loop

This is the note taken while I was learning C# from Bro Code’s Youtube Tutorials.

💧What we learn

• string methods
• for loop
• array
• foreach loop

🔥Good Resource

💠Learncs.org

💠Bro Code

💠GeeksforGeeks

⚡String methods

🔸ToUpper() & ToLower()

using System;

class Program
{
    public static void Main(string[] args)
    {

        String name = "Alice Jin";
        String upName = name.ToUpper();
        String loName = name.ToLower();

        Console.WriteLine(name);
        Console.WriteLine(upName);
        Console.WriteLine(loName);

        Console.ReadKey();
    }
}
/*
Alice Jin
ALICE JIN
alice jin
*/

🔸Replace

using System;

class Program
{
    public static void Main(string[] args)
    {

        String call = "123-456-789";
        Console.WriteLine(call);
        call = call.Replace("-", "");
        Console.WriteLine(call);

        Console.ReadKey();
    }
}
/*
123-456-789
123456789
*/

🔸Insert

using System;

class Program
{
    public static void Main(string[] args)
    {

        String name = "Alice Jin";
        name = name.Insert(0, "Miss ");
        Console.WriteLine(name);

        Console.ReadKey();
    }
}
/*
Miss Alice Jin
*/

🔸Substring

using System;

class Program
{
    public static void Main(string[] args)
    {

        String name = "Alice Jin";
        name = name.Substing(0, 3);
        Console.WriteLine(name);

        Console.ReadKey();
    }
}

⚡for loop

🔸Example #1

using System;

class Program
{
    public static void Main(string[] args)
    {

        Console.WriteLine("Type rows: ");
        int rows = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("Type columns: ");
        int columns = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("Type symbols: ");
        String symbol= Console.ReadLine();

        for (int i = 0; i < rows; i++){
          for(int j =0; j< columns; j++){
            Console.Write(symbol);
          }
          Console.WriteLine();
        }
    
        Console.ReadKey();
    }
}
/*
Type rows: 
2
Type columns: 
5
Type symbols: 
*
*****
*****
*/

⚡Array

🔸Example #1

using System;

class Program
{
    public static void Main(string[] args)
    {
        /* Array Declaration #1 */
        String[] fruits = { "Apple", "Avocado", "Lemon" };
        /* Array Declaration #2 */
        String[] cars = new String[3];
        cars[0] = "Porsche";
        cars[1] = "Tesla";
        cars[2] = "Fox";
        Console.WriteLine();


        Console.ReadKey();
    }
}

⚡foreach

🔸Example #1

This is for loop.

/* Array Declaration #1 */
        String[] fruits = { "Apple", "Avocado", "Lemon" };
        for (int i = 0; i < fruits.Length; i++)
        {
            Console.WriteLine(fruits[i]);
        }

This is foreach loop.

String[] cars = new String[3];
        cars[0] = "Porsche";
        cars[1] = "Tesla";
        cars[2] = "Fox";
        foreach (String car in cars)
        {
            Console.WriteLine(car);
        }

🟢Whole codes

using System;

class Program
{
    public static void Main(string[] args)
    {
        /* Array Declaration #1 */
        String[] fruits = { "Apple", "Avocado", "Lemon" };
        for (int i = 0; i < fruits.Length; i++)
        {
            Console.WriteLine(fruits[i]);
        }
        /* Array Declaration #2 */
        String[] cars = new String[3];
        cars[0] = "Porsche";
        cars[1] = "Tesla";
        cars[2] = "Fox";
        foreach (String car in cars)
        {
            Console.WriteLine(car);
        }

        Console.ReadKey();
    }
}
/*
Apple
Avocado
Lemon
Porsche
Tesla
Fox
*/