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  1.  
  2. #include <stdio.h>
  3.    int main() {
  4.     double a, b, c, p, area;
  5.     printf("请输入三角形三条边长：");
  6.     scanf("%lf %lf %lf", &a, &b, &c);
  7.  
  8.     // 计算半周长
  9.     p = (a + b + c) / 2;
  10.  
  11.     // 海伦公式
  12.     area = sqrt(p * (p - a) * (p - b) * (p - c));
  13.  
  14.     printf("三角形面积为：%.2lf\n", area);
  15.  
  16.     return 0;
  17. }
  18.  
Success #stdin #stdout 0.01s 5320KB
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请输入三角形三条边长：三角形面积为：-nan
https://ideone.com/WIyC5x
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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