c - 如何传递参数

Question

您好，我知道代码不完整，但我试图找到三角形的面积，但我很难找到要放置的正确函数以及返回哪个函数以获得输出。我知道我会返回方程，但我不知道应该将 area1 = 设置为

 #include <stdio.h>
 #include <math.h>
 double calculateArea(double, double, double, double, double, double);


int main () {
double x1, x2, x3, y1, y2, y3, area1, premiter1;
printf("Enter the coordinate planes");
scanf("%lf", &x1);
scanf("%lf", &y1);
scanf("%lf", &x2);
scanf("%lf", &y2);
scanf("%lf", &x3);
scanf("%lf", &y3);
area1 =
printf("Area : %lf", area1);
return 0;
}

double calculateArea() { 

return 

} 

Answer 1

不完全理解你的问题，但似乎这就是要实现的目标:

#include <stdio.h>
 #include <math.h>
 double calculateArea(double, double, double, double, double, double);


int main () {
double x1, x2, x3, y1, y2, y3, area1, premiter1;
printf("Enter the coordinate planes");
scanf("%lf", &x1);
scanf("%lf", &y1);
scanf("%lf", &x2);
scanf("%lf", &y2);
scanf("%lf", &x3);
scanf("%lf", &y3);
area1 = calculateArea(x1, y1, x2, y2, x3, y3);
printf("Area : %lf", area1);
return 0;
}

double calculateArea(double x1, double y1, double x2, double y2, double x3, double y3) { 
double area;
//your logic here.
return area;

} 

同样，您可以使用周长。