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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct Triangle {
  5.     double a;
  6.     double b;
  7.     double c;
  8. };
  9. int main(void) {
  10.     struct Triangle tri;
  11.     double p;
  12.     double s;
  13.  
  14.     printf("辺aの長さを入力してください: ");
  15.     scanf("%lf", &tri.a);
  16.     printf("辺bの長さを入力してください: ");
  17.     scanf("%lf", &tri.b);
  18.     printf("辺cの長さを入力してください: ");
  19.     scanf("%lf", &tri.c);
  20.  
  21.     p = (tri.a + tri.b + tri.c) / 2.0;
  22.     s = sqrt(p * (p - tri.a) * (p - tri.b) * (p - tri.c));
  23.  
  24.     printf("\n a:%f\n b:%f\n c:%f\n", tri.a, tri.b, tri.c);
  25.     printf(" 三角形の面積:%lf\n", s);
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5288KB
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5
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5
stdout
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辺aの長さを入力してください: 辺bの長さを入力してください: 辺cの長さを入力してください: 
 a:5.000000
 b:5.000000
 c:5.000000
 三角形の面積:10.825318
https://ideone.com/fVCy89
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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