Contents

• while Loop - Coding Exercises
• do-while Loop - Coding Exercises

Section 1: while Loop

Problem Statement 1: Repeat a Message

Task: Write a C++ program using a while loop to display your name five times, with each repetition on a new line.

Expected Output:

Hamza
Hamza
Hamza
Hamza
Hamza

Note: Replace Hamza with your own name.

Problem Statement 2: Print a Sequence

Task: Write a C++ program using a while loop to display all integers from 1 to 50 in ascending order.

Expected Output:

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50

Problem Statement 3: Print Odd Numbers

Task: Write a C++ program using a while loop to display all odd numbers from 1 to 25 in ascending order.

Expected Output:

1 3 5 7 9 11 13 15 17 19 21 23 25

Problem Statement 4: Countdown

Task: Write a C++ program using a while loop to display numbers from 50 down to 1 in descending order.

Expected Output:

50 49 48 47 46 45 44 43 42 41
40 39 38 37 36 35 34 33 32 31
30 29 28 27 26 25 24 23 22 21
20 19 18 17 16 15 14 13 12 11
10 9 8 7 6 5 4 3 2 1

Problem Statement 5: Calculate a Sum

Task: Write a C++ program using a while loop to calculate and display the sum of all integers from 1 to 20.

Expected Output:

Sum = 210

Hint: Use a variable to store the running sum and update it during each loop iteration.

Problem Statement 6: Multiplication Table

Exercise ID: LOOP-COD-006

Solution: View Solution

Task: Write a C++ program that asks the user to enter an integer and displays its multiplication table from 1 to 10 using a while loop.

Sample Input:

Enter a number: 7

Expected Output:

Multiplication Table of 7
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70

Section 2: do-while Loop

Problem Statement 7: Repeat a Message

Task: Write a C++ program using a do-while loop to display your name five times.

Expected Output:

Hamza
Hamza
Hamza
Hamza
Hamza

Note: Replace Hamza with your own name.

Problem Statement 8: Print Numbers from 1 to 20

Task: Write a C++ program using a do-while loop to display numbers from 1 to 20 in ascending order.

Expected Output:

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20

Problem Statement 9: Print Numbers in Reverse Order

Task: Write a C++ program using a do-while loop to display numbers from 20 down to 1.

Expected Output:

20 19 18 17 16 15 14 13 12 11
10 9 8 7 6 5 4 3 2 1

Problem Statement 10: Display Even Numbers

Task: Write a C++ program using a do-while loop to display all even numbers from 2 to 50.

Expected Output:

2 4 6 8 10 12 14 16 18 20
22 24 26 28 30 32 34 36 38 40
42 44 46 48 50

Problem Statement 11: Multiplication Table

Task: Write a C++ program that asks the user to enter a number and displays its multiplication table from 1 to 10 using a do-while loop.

Sample Input:

Enter a number: 5

Expected Output:

Multiplication Table of 5
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
5 x 4 = 20
5 x 5 = 25
5 x 6 = 30
5 x 7 = 35
5 x 8 = 40
5 x 9 = 45
5 x 10 = 50

Problem Statement 12: Calculate the Sum from 1 to n

Task: Write a C++ program that asks the user to enter a positive integer n and calculates the sum of all numbers from 1 to n using a do-while loop.

Sample Input:

Enter a positive integer: 5

Expected Output:

Sum = 15

Problem Statement 13: Display Odd Numbers

Task: Write a C++ program that asks the user to enter a positive integer and displays all odd numbers from 1 up to that number using a do-while loop.

Sample Input:

Enter a positive integer: 15

Expected Output:

Odd numbers: 1 3 5 7 9 11 13 15

Problem Statement 14: Sum of Even Numbers

Task: Write a C++ program that asks the user to enter a positive integer n and calculates the sum of all even numbers from 1 to n using a do-while loop. Use an if statement to check whether each number is even.

Hint: Use if (number % 2 == 0) to identify even numbers, add them to sum, and increment number in each iteration.

Sample Input:

100

Expected Output:

Enter a positive integer: 100
Sum of even numbers from 1 to 100 = 2550

Problem Statement 15: Sum of Odd Numbers

Task: Write a C++ program that asks the user to enter a positive integer n and calculates the sum of all odd numbers from 1 to n using a do-while loop. Use an if statement to check whether each number is odd.

Hint: Use if (number % 2 != 0) to identify odd numbers, add them to sum, and increment number in each iteration.

Sample Input:

100

Expected Output:

Enter a positive integer: 100
Sum of odd numbers from 1 to 100 = 2500

Problem Statement 16: Identify Even and Odd Numbers

Task: Write a C++ program that asks the user to enter a positive integer n and displays every number from 1 to n with its status, Even or Odd, using a do-while loop and an if-else statement.

Hint: Use if (number % 2 == 0) to identify even numbers and else to identify odd numbers.

Sample Input:

100

Expected Output (first 10 and last 5 lines shown):

Enter a positive integer: 100
 
1 is Odd
2 is Even
3 is Odd
4 is Even
5 is Odd
6 is Even
7 is Odd
8 is Even
9 is Odd
10 is Even
...
96 is Even
97 is Odd
98 is Even
99 is Odd
100 is Even

Note: Your program must display all numbers from 1 to 100, not just the numbers shown above.

Problem Statement 17: Repeating Menu

Task: Write a C++ program that displays the following menu repeatedly using a do-while loop until the user selects Exit (option 3).

Menu:

===== Main Menu =====
1. Say Hello
2. Display Welcome Message
3. Exit
Enter your choice:

Requirements:

• If the user selects 1, display Hello!.
• If the user selects 2, display Welcome to C++ Programming!.
• If the user selects 3, display Program terminated. and stop the loop.
• For any other choice, display Invalid choice. Please try again..

Sample Input:

1
2
3

Expected Output:

===== Main Menu =====
1. Say Hello
2. Display Welcome Message
3. Exit
Enter your choice: 1
Hello!
 
===== Main Menu =====
1. Say Hello
2. Display Welcome Message
3. Exit
Enter your choice: 2
Welcome to C++ Programming!
 
===== Main Menu =====
1. Say Hello
2. Display Welcome Message
3. Exit
Enter your choice: 3
Program terminated.

Problem Statement 18: Validate Positive Input

Task: Write a C++ program that asks the user to enter a positive number. If the number is zero or negative, keep asking until the user enters a positive number.

Sample Input:

Enter a positive number: -5
Enter a positive number: 0
Enter a positive number: -2
Enter a positive number: 8

Expected Output:

Valid number entered: 8

Problem Statement 19: Simple Calculator Menu

Exercise ID: LOOP-COD-019

Solution: View Solution

Task: Write a C++ program that repeatedly displays a calculator menu using a do-while loop until the user selects Exit.

Menu Options:

1. Addition
2. Subtraction
3. Exit

Requirements:

• If the user selects 1, ask for two numbers and display their sum.
• If the user selects 2, ask for two numbers and display their difference.
• Display the menu again after each calculation.
• If the user selects 3, display Calculator closed. and terminate the loop.
• For an invalid choice, display an appropriate error message.

Sample Input:

1
10 5
2
10 5
3

Expected Output:

===== Simple Calculator =====
1. Addition
2. Subtraction
3. Exit
Enter your choice: 1
Enter two numbers: 10 5
Sum = 15
 
===== Simple Calculator =====
1. Addition
2. Subtraction
3. Exit
Enter your choice: 2
Enter two numbers: 10 5
Difference = 5
 
===== Simple Calculator =====
1. Addition
2. Subtraction
3. Exit
Enter your choice: 3
Calculator closed.