#include <stdio.h>

#define F1(X) ((X > 0) ? X : -(X))
#define F2(X) (X > 0) ? X : -X

int main(){
    int a=5, b=10;
    printf("F1=%d, F2=%dn", F1(a-b), F2(a-b));
    return 0;
}