Boost Your C# 'For Loop' Abilities: Essential Exercises for HNDIT Students

Here are some basic for loop exercises in C# . These exercises stick to simple counting and looping tasks that help students practice the structure of for loops.

Exercise 1: Print Numbers from 1 to 10

Objective: Introduce the structure of a for loop.

// Print numbers from 1 to 10
for (int i = 1; i <= 10; i++)
{
    Console.WriteLine(i);
}

Exercise 2: Print Even Numbers from 2 to 20

Objective: Understand how to control the loop step size.

// Print even numbers from 2 to 20
for (int i = 2; i <= 20; i += 2)
{
    Console.WriteLine(i);
}

Exercise 3: Print Odd Numbers from 1 to 19

Objective: Practice using a loop to print specific numbers (odd).

// Print odd numbers from 1 to 19
for (int i = 1; i < 20; i += 2)
{
    Console.WriteLine(i);
}

Exercise 4: Print Multiplication Table of a Given Number

Objective: Use a for loop to display a multiplication table.

// Print multiplication table of 5
int number = 5;
for (int i = 1; i <= 10; i++)
{
    Console.WriteLine(number + " x " + i + " = " + (number * i));
}

Exercise 5: Calculate the Sum of Numbers from 1 to N

Objective: Use a for loop to calculate a sum up to a given number, N.

// Calculate and print the sum of numbers from 1 to N
int N = 10; // You can change N to any positive integer
int total = 0;
for (int i = 1; i <= N; i++)
{
    total += i;
}
Console.WriteLine("Sum: " + total);

Exercise 6: Count Down from 10 to 1

Objective: Use a decrementing for loop.

// Print numbers from 10 down to 1
for (int i = 10; i >= 1; i--)
{
    Console.WriteLine(i);
}

Exercise 7: Print Powers of 2 up to 1024

Objective: Use a for loop to demonstrate exponential growth by printing powers of 2.

// Print powers of 2 up to 1024
for (int i = 1; i <= 1024; i *= 2)
{
    Console.WriteLine(i);
}

Exercise 8: Calculate the Factorial of a Given Number

Objective: Use a for loop to calculate factorial (multiplying a series of numbers).

// Calculate and print the factorial of a given number, N
int N = 5; // Change N to any positive integer
int factorial = 1;
for (int i = 1; i <= N; i++)
{
    factorial *= i;
}
Console.WriteLine("Factorial of " + N + " is " + factorial);

Here’s a for loop exercise in C# to print a simple triangle pattern. This exercise will help students practice using nested loops to create patterns.

Exercise 9: Create a Triangle Pattern

Objective: Use nested for loops to print a triangle pattern with stars (*).

// Create a triangle pattern
int rows = 5; // Number of rows in the triangle

for (int i = 1; i <= rows; i++)
{
    for (int j = 1; j <= i; j++)
    {
        Console.Write("*");
    }
    Console.WriteLine(); // Move to the next line after each row
}

Expected Output:

*
**
***
****
*****

Explanation

• The outer loop (for loop with i) controls the number of rows.

• The inner loop (for loop with j) controls the number of * characters printed on each row, increasing with each iteration of the outer loop.

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Exercise 10: Right-Aligned Triangle

Objective: Print a right-aligned triangle using spaces and stars.

int rows = 5;

for (int i = 1; i <= rows; i++)
{
    for (int j = 1; j <= rows - i; j++)
    {
        Console.Write(" ");
    }
    for (int k = 1; k <= i; k++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

Expected Output:

    *
   **
  ***
 ****
*****

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Exercise 11: Inverted Left-Aligned Triangle

Objective: Print an inverted left-aligned triangle.

int rows = 5;

for (int i = rows; i >= 1; i--)
{
    for (int j = 1; j <= i; j++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

Expected Output:

*****
****
***
**
*

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Exercise 12: Inverted Right-Aligned Triangle

Objective: Print an inverted right-aligned triangle.

int rows = 5;

for (int i = rows; i >= 1; i--)
{
    for (int j = 1; j <= rows - i; j++)
    {
        Console.Write(" ");
    }
    for (int k = 1; k <= i; k++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

Expected Output:

*****
 ****
  ***
   **
    *

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Exercise 13: Symmetrical Pyramid

Objective: Print a symmetrical pyramid.

int rows = 5;

for (int i = 1; i <= rows; i++)
{
    for (int j = 1; j <= rows - i; j++)
    {
        Console.Write(" ");
    }
    for (int k = 1; k <= (2 * i - 1); k++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

Expected Output:

    *
   ***
  *****
 *******
*********

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Exercise 14: Inverted Symmetrical Pyramid

Objective: Print an inverted symmetrical pyramid.

int rows = 5;

for (int i = rows; i >= 1; i--)
{
    for (int j = 1; j <= rows - i; j++)
    {
        Console.Write(" ");
    }
    for (int k = 1; k <= (2 * i - 1); k++)
    {
        Console.Write("*");
    }
    Console.WriteLine();
}

Expected Output:

*********
 *******
  *****
   ***
    *

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