程序代码：

double triangle_area(double base, double hight)
    {
        double product;
        product = base*hight;
        return product / 2;
    }
    double a, b;
    scanf_s("%lf,%lf", &a, &b);
    printf("%lf", triangle_area(a, b));

程序代码：

#include <stdio.h>
int  main(void)
{
    double triangle_area(double base, double hight)
    {
        double product;
        product = base*hight;
        return product / 2;
    }
    double a, b;
    scanf_s("%lf,%lf", &a, &b);
    printf("%lf", triangle_area(a, b));
    system("pause");
    return 0;
}