#include <stdio.h>

int substract(int a, int b){
    printf("substract has been called with %d,%d\n",a,b);
    return b-a;
    
}

int main(){
    int x,i;

    x=substract(1,8)+substract(9,1);

    for(i=0; i<10; i++){
        substract(i,10);
    }
    
    printf("output is %d",x);

    return 0;
}