How do I reverse the Interger Number in C with Example Code

#include "stdafx.h"
#include <conio.h>
#include "stdlib.h"
#include "stdio.h"
#include "string.h"

int reverseInt(int num)
{
    int rnum = 0;
    printf("%d\n", num);  
    while(0 != num){
        rnum = (rnum * 10) + (num % 10);  
        num = num / 10;
        //printf("%d\n", num);      
        //printf("%d\n", rnum);
    }
    return (rnum = rnum + num);

}

int main()
{
    int a = 12345;
    int revnum = 0;
    revnum = reverseInt(a);  

    printf("%d", revnum);

    getch();
    return 0;
  
}

Output:

54321

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