What will be the output of the following code

#include stdio.h  
void change(int,int);  
int main()  
{  
    int a=10,b=20;  
    change(a,b); 
    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;  
}