C语言练习篇-6利用指针通过形参传值给主调函数

void fun(double a, double b, double *ps, double *pd){
*ps = a + b;
*pd = (a - b) < 0 ? (- (a - b)) : (a - b);
}

int main() {

double a = 10.6, b = 20.12;

fun(a, b, &a, &b);

printf("sum value = %f,diff value = %f\n",a,b);

return 0;
}

void fun(double a, double b, double c, double *pmax, double *pmin){
*pmax = a > b ? (a > c ? a : c) : (b > c ? b : c);
*pmin = a < b ? (a < c ? a : c) : (b < c ? b : c);
}

int main() {

double a = 10.6, b = 20.12, c = 30.24;

double *pmax = &a, *pmin = &b;

fun(a, b, c, pmax, pmin);

printf("max = %f,min = %f\n", *pmax, *pmin);

return 0;
}