#include <stdio.h>

#define N 6

int g = 1.;

double fun(double x, double y[]) {
    y[4] *= g;
    printf("fun:    %f  %f  %d\n", x, y[4], g);
    return((y[1] + y[4])*x);
}

int main(void) {
    double x = 2., y[N];
    int i;
    
    g += 1;
    for(i = 0; i < N; i++) {
        y[i] = g*i;
    }

    printf("main 1: %f  %f  %d\n", x, y[4], g);
    x = fun(x, y);
    printf("main 2: %f  %f  %d\n", x, y[4], g);

    return(0);
}