Program to Find the Reverse of a Number in C

Reversing a Number

The reverse of a number is obtained by extracting each digit and constructing a new number in reverse order.

We will explore a method to compute the reverse of a number using C programming.

Method: Using a while Loop

We extract each digit using the modulus operator and build the reversed number.

#include <stdio.h>

int main() {
    int num, reversed = 0, digit;
    
    // Prompt user for input
    printf("Enter a number: ");
    scanf("%d", &num);
    
    // Loop to extract and reverse digits
    while (num > 0) {
        digit = num % 10; // Extract last digit
        reversed = reversed * 10 + digit; // Construct reversed number
        num /= 10; // Remove last digit from number
    }
    
    // Print the result
    printf("Reversed number = %d", reversed);
    
    return 0;
}
            

Output:

Enter a number: 1234
Reversed number = 4321