Reverse Number program in C

/* program to reverse an integer number.*/

#include <stdio.h>

int main()
{
    int n;
    int dig, revNumber;

    printf("Enter an integer number : ");
    scanf("%d", &n);

    /*Reversing Number*/
    revNumber = 0;

    while (n > 0) {
        dig = n % 10; /*get digit*/
        revNumber = (revNumber * 10) + dig;
        n = n / 10;
    }

    printf("Reverse Number is : %d\n", revNumber);
    return 0;
}

Output:

Enter an integer number : 1234
Reverse Number is : 4321

Using User Define Function

/* program to reverse an integer number.*/

#include <stdio.h>

/*	function:	reverseNum
	to reverse an integer number.
*/

int reverseNum(int num)
{
    int sum = 0, rem;
    while (num > 0) {
        rem = num % 10;
        sum = (sum * 10) + rem;
        num = num / 10;
    }

    return sum;
}

int main()
{
    int n;
    printf("Enter an integer number : ");
    scanf("%d", &n);

    printf("Reverse Number is : %d\n", reverseNum(n));
    return 0;
}

Output:

Enter an integer number : 1234
Reverse Number is : 4321