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C++ Coding Exercises - Loops


Practice C++ programming with coding exercises covering variables, data types, operators, input and output, type casting, conditional statements, loops, functions, arrays, and other C++ fundamentals.

Contents

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.

Section 3: for Loop

Problem Statement 20: Print Your Name 10 Times

Task: Write a C++ program that asks the user to enter their name and displays the name 10 times using a for loop.

Hint: Use a loop that executes exactly 10 times.

Sample Input:

Ahmad

Expected Output:

Ahmad
Ahmad
Ahmad
Ahmad
Ahmad
Ahmad
Ahmad
Ahmad
Ahmad
Ahmad

Problem Statement 21: Print Numbers from 1 to 100

Task: Write a C++ program that displays all numbers from 1 to 100 in ascending order using a loop.

Hint: Initialize a loop variable with 1 and continue until it reaches 100.

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

1 2 3 4 5 6 7 8 9 10
...
96 97 98 99 100

Problem Statement 22: Print Numbers from 100 Down to 1

Task: Write a C++ program that displays all numbers from 100 down to 1 in descending order using a loop.

Hint: Initialize the loop variable with 100 and decrease it by 1 in each iteration.

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

100 99 98 97 96 95 94 93 92 91
...
5 4 3 2 1

Problem Statement 23: Print Odd Numbers from 1 to 49

Task: Write a C++ program that displays all odd numbers between 1 and 49 using a loop.

Hint: Use the modulus operator % to check whether a number is odd. An odd number leaves a remainder of 1 when divided by 2.

Expected Output:

1 3 5 7 9 11 13 15 17 19
...
41 43 45 47 49

Problem Statement 24: Calculate the Sum of Numbers 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 loop.

Hint: Initialize a variable sum with 0. Add each number to sum during every iteration.

Sample Input:

Enter a number: 10

Expected Output:

Sum of numbers from 1 to 10 = 55

Problem Statement 25: Display the Multiplication Table of a Number

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

Hint: Multiply the user-entered number by the loop variable in each iteration.

Sample Input:

Enter a number: 5

Expected Output:

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 26: Count Numbers Divisible by 5

Task: Write a C++ program that counts how many numbers between 1 and 100 are divisible by 5 and displays the total count.

Hint: Use the modulus operator % to check divisibility. If number % 5 == 0, increase the counter by 1.

Expected Output:

Numbers divisible by 5 between 1 and 100 = 20

Problem Statement 27: Calculate the Sum of Even Numbers from 2 to 100

Task: Write a C++ program that calculates and displays the sum of all even numbers from 2 to 100 using a for loop.

Hint: Start with 2 and increase the loop variable by 2 in each iteration. Use an accumulator variable to calculate the total sum.

Expected Output:

Sum of even numbers from 2 to 100 = 2550

Problem Statement 28: Calculate the Total of Five Numbers

Task: Write a C++ program that asks the user to enter five numbers and calculates and displays their total using a for loop.

Hint: Initialize a variable total with 0. Use a loop to take five inputs and add each entered number to total.

Sample Input:

Enter number 1: 10
Enter number 2: 20
Enter number 3: 30
Enter number 4: 40
Enter number 5: 50

Expected Output:

Total of five numbers = 150

Section 4: Nested Loop

Problem Statement 29: Calculate the Factorial of a Number

Task: Write a C++ program that asks the user to enter a non-negative integer n and calculates its factorial using a loop. The factorial is the product of all positive integers from 1 to n. The factorial of 0 is 1.

Hint: Initialize a variable factorial with 1. Multiply it by each number from 1 to n.

Sample Input:

Enter a number: 5

Expected Output:

5! = 5 x 4 x 3 x 2 x 1 = 120

Problem Statement 30: Display a Right-Angled Triangle of Stars

Exercise ID: LOOP-COD-030

Solution: View Solution

Task: Write a C++ program that asks the user to enter a positive integer representing the number of rows and displays a right-angled triangle pattern of stars (*) using nested loops.

Each row should contain stars equal to its row number. For example, the first row should contain 1 star, the second row 2 stars, and so on.

Hint: Use an outer loop to control the rows and an inner loop to control the number of stars in each row.

Sample Input:

Enter number of rows: 5

Expected Output:

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

Problem Statement 31: Display Multiplication Tables from 1 to 5

Task: Write a C++ program using nested for loops to display multiplication tables for all numbers from 1 to 5. Each multiplication table should contain multiples from 1 to 10.

Hint: Use the outer loop to select the multiplication table (1 to 5) and the inner loop to calculate multiples (1 to 10).

Expected Output:

Multiplication Table of 1
1 x 1 = 1
1 x 2 = 2
...
1 x 10 = 10

Multiplication Table of 2
2 x 1 = 2
2 x 2 = 4
...
2 x 10 = 20

...

Multiplication Table of 5
5 x 1 = 5
5 x 2 = 10
...
5 x 10 = 50

Section 5: break and continue

Problem Statement 32: Print Numbers Using an Infinite for Loop and break

Write a C++ program that uses an infinite for loop to print numbers from 1 to 4. Use the break statement to terminate the loop after printing 4.

Requirements:

  1. Use an infinite for loop (for(;;)).
  2. Start printing numbers from 1.
  3. Use the break statement to terminate the loop when the number reaches 4.
  4. Display each number on a separate line.

Expected Output:

1
2
3
4

Problem Statement 33: Use continue in Nested for Loops

Write a C++ program using nested for loops with the following requirements:

  1. The outer loop (i) should execute 5 times (from 1 to 5).
  2. The inner loop (j) should execute 5 times (from 1 to 5).
  3. Use the continue statement to skip the current inner loop iteration when j == 3.
  4. Continue executing the remaining iterations of the inner loop.
  5. The outer loop must complete all 5 iterations.

Expected Output:

i = 1
j = 1
====
i = 1
j = 2
====
i = 1
j = 4
====
i = 1
j = 5
====
i = 2
j = 1
====
...
...
i = 5
j = 5
====

Note: The continue statement skips only the current iteration of the inner loop. It does not terminate the outer loop.