用c语言编程实现输入三角形三个顶点坐标，判断能否构成三角形

```c #include <stdio.h> #include <math.h> int main() { double x1, y1, x2, y2, x3, y3; printf("请输入三角形的三个顶点坐标：\n"); scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3); double a = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); double b = sqrt((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3)); double c = sqrt((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3)); if(a + b > c && a + c > b && b + c > a){ // 判断是否能构成三角形，两边之和大于第三边即可构成三角形 printf("能够构成三角形。\n"); } else{ printf("不能够构成三角形。\n"); } return 0; } ```