How to get reverse of a number

CODE

How to get reverse of a number

If a five digit number is input through the keyboard , write a program to reverse the number

int main()

{

    int num,rev,r1,r2,r3,r4;

    printf("\n enter a 5 digit number:");

    scanf("\n %d",&num);                                                 

    r1=num%10;

    num=num/10;

    r2=num%10;

    num=num/10;

    r3=num%10;

    num=num/10;

    r4=num%10;

    num=num/10;

    rev=r1*10000+r2*1000+r3*100+r4*10+num;

    printf("\n reverse=%d",rev);

}

Output:

enter a 5 digit number:

12345

 reverse=54321