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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. // 三角形の3辺を表す構造体
  5. struct Triangle {
  6.     double a;
  7.     double b;
  8.     double c;
  9. };
  10.  
  11. int main(void) {
  12.     struct Triangle triangle;
  13.  
  14.     // ユーザーに3辺の長さを入力してもらう
  15.     printf("辺 a: ");
  16.     scanf("%lf", &triangle.a);
  17.     printf("辺 b: ");
  18.     scanf("%lf", &triangle.b);
  19.     printf("辺 c: ");
  20.     scanf("%lf", &triangle.c);
  21.  
  22.     // ヘロンの公式による面積計算
  23.     double s = (triangle.a + triangle.b + triangle.c) / 2.0;
  24.     double area = sqrt(s * (s - triangle.a) * (s - triangle.b) * (s - triangle.c));
  25.  
  26.     // 結果の出力
  27.     printf("\n三角形の辺: a = %.2lf, b = %.2lf, c = %.2lf\n", triangle.a, triangle.b, triangle.c);
  28.     printf("三角形の面積: %.2lf\n", area);
  29.  
  30.     return 0;
  31. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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5,5,5
stdout
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辺 a: 辺 b: 辺 c: 
三角形の辺: a = 5.00, b = 0.00, c = 0.00
三角形の面積: -nan
https://ideone.com/YMNQBu
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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