What will be the output of the following code snippet?

#include <stdio.h>
void change(int,int);
int main()
{
   int a=10,b=20;
   change(a,b); //calling a function by passing the values of variables.
   printf("Value of a is: %d",a);
   printf("\n");
   printf("Value of b is: %d",b);
   return 0;
}
void change(int x,int y)
{
   x=13;
   y=17;
}