C Exercises: Reverse and print a given number

Last update on September 18 2025 12:35:41 (UTC/GMT +8 hours)

Reverse the digits of a number

Write a C program to reverse and print a given number.

Pictorial Presentation:

Sample Solution:

C Code:

#include<stdio.h>
int main() {
    int num, x, r_num = 0;

    // Prompt user to input a number
    printf("Input a number: ");
    scanf("%d", &num);

    // Display the original number
    printf("\nThe original number = %d", num);

    // Reverse the digits of the number
    while (num >= 1) {
        x = num % 10;
        r_num = r_num * 10 + x;
        num = num / 10;
    }

    // Display the reverse of the number
    printf("\nThe reverse of the said number = %d", r_num);

    return 0;
}

Sample Output:

Input a number: 
The original number = 234
The reverse of the said number = 432

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to reverse the digits of an integer recursively without converting it to a string.
• Write a C program to reverse the digits of a number and determine if the result is a palindrome.
• Write a C program to reverse the digits using iterative division and modulus operations.
• Write a C program to reverse an integer and then add the reversed number to the original.

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