C语言：输入三数判断能否成三角形并算周长面积

```c #include <stdio.h> #include <math.h> int main() { double a, b, c; printf("请输入三个数a，b，c："); scanf("%lf %lf %lf", &a, &b, &c); if (a + b > c && a + c > b && b + c > a) { double perimeter = a + b + c; double s = perimeter / 2; double area = sqrt(s * (s - a) * (s - b) * (s - c)); printf("三角形的周长是：%.2f\n", perimeter); printf("三角形的面积是：%.2f\n", area); } else { printf("这个数据不能构成三角形\n"); } return 0; } ``` ######[AI写代码神器 | 213点数解答 | 2024-11-02 16:20:33]