C Programming Language

#include <stdio.h>

int main(int argc, const char * argv[])
{
    int input = 123;
    int temp, r, output = 0;
    temp = input;

    while (temp > 0) {
        r = temp % 10;
        temp = temp / 10;
        output = output * 10 + r;
    }

    printf("Original Number : %d \n", input);
    printf("Reverse Number : %d \n", output);
    
    return 0;
}