C program to reverse a number using "Recursion".

Recursion in C

/*C program to reverse a number*/
#include<stdio.h>
reverse_function(int num);
int main()
{
int num,reverse_number;

printf("Enter any number:");
scanf("%d",&num);           //User would input the number

reverse_number=reverse_function(num);    //Calling user defined function to perform reverse

printf("\nAfter reverse the no is :%d",reverse_number);
return 0;
}
int sum=0,rem;
reverse_function(int num)
{
if(num)
{
      rem=num%10;
sum=sum*10+rem;
      reverse_function(num/10);
   }
else
return sum;
return sum;
}

Expected Output: 
Enter any number: 2345
After reverse the no is : 5432