C program to calculate exp(x,y) using recursive functions

#include <stdio.h>
int exp_rec(int, int);
int main()
{
int num1, num2, res;
printf("\n Enter the two numbers: ");
scanf("%d %d", &num1, &num2);
res = exp_rec(num1, num2);
printf ("\n RESULT = %d", res); 
return 0;
}
int exp_rec(int x, int y)
{
if(y==0)
 return 1;
else
 return (x * exp_rec(x, y–1));
}