Decimal to Binary conversion using C

/*
 * C Program to Print Binary Equivalent of an Integer using Recursion
 */
#include <stdio.h>

int binary_conversion(int);

int main()
{
   int num, bin;

   printf("Enter a decimal number: ");
   scanf("%d", &num);
   bin = binary_conversion(num);
   printf("The binary equivalent of %d is %d\n", num, bin);
}

int binary_conversion(int num)
{
    if (num == 0)
    {
        return 0;
    }
    else
    {
        return (num % 2) + 10 * binary_conversion(num / 2);
    }
}