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  1.  
  2. #include <stdio.h>
  3. #include <math.h>
  4.  
  5. /* 三角形の3辺を表す構造体 */
  6. struct Triangle {
  7.     double a;
  8.     double b;
  9.     double c;
  10. };
  11.  
  12. int main(void){
  13.     struct Triangle t;
  14.     double p;
  15.     double s;
  16.  
  17.     /* 入力 */
  18.  
  19.     scanf("%lf %lf %lf", &t.a, &t.b, &t.c);
  20.  
  21.     /* 半周長 */
  22.     p = (t.a + t.b + t.c) / 2.0;
  23.  
  24.     /* ヘロンの公式（sqrt を使用） */
  25.     s = sqrt(p * (p - t.a) * (p - t.b) * (p - t.c));
  26.  
  27.     /* 出力 */
  28.     printf("a = %.2f, b = %.2f, c = %.2f\n", t.a, t.b, t.c);
  29.     printf("面積 s = %.6f\n", s);
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
5 5 5
stdout 
a = 5.00, b = 5.00, c = 5.00
面積 s = 10.825318
https://ideone.com/VHcHkD
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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