c - 将变量传递给 C 中的函数

Question

#include <stdio.h>
//function prototype
double triangle(double b ,double h);
//main function
int main(void)
{
    //declare variables
    double height,base, ans;
    //take input
    printf("Please give the height of the triangle:");
    scanf("%d",&height);
    printf("Please give the base of the triangle:");
    scanf("%d",&base);
    //pass variables to triangle function and equal returned value to ans
    ans = triangle(base,height);
    //prdouble returned doubleeger
    system("CLS");
    system("COLOR C");
    printf("\n\n\t\t\tThe area of the triangle is: %d\n\n\n", ans );
    return 0;
}
//area function
double triangle(double b, double h)
{
    printf("Hello");
    //declare varible 
    double a;
    //process data
    a = (b*h)/2;
    //return ans to main
    return (a);

}

上面是计算三角形面积的程序代码，但当我使用整数时它可以工作，当我尝试使用 double 时它无法运行“三角形”函数。我能得到一些关于为什么会这样的建议吗？

Answer 1

使用%lf 读取double 数字:

scanf("%lf",&height);
scanf("%lf",&base);

使用%f 打印double 或float 变量:

printf("\n\n\t\t\tThe area of the triangle is: %f\n\n\n", ans );