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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.  
  10. int main(void) {
  11.     struct Triangle triangle;
  12.  
  13.     printf("辺 a: ");
  14.     scanf("%lf", &triangle.a);
  15.     printf("辺 b: ");
  16.     scanf("%lf", &triangle.b);
  17.     printf("辺 c: ");
  18.     scanf("%lf", &triangle.c);
  19.  
  20.     double s = (triangle.a + triangle.b + triangle.c) / 2.0;
  21.     double area = sqrt(s * (s - triangle.a) * (s - triangle.b) * (s - triangle.c));
  22.  
  23.     printf("\n三角形の辺: a = %.2lf, b = %.2lf, c = %.2lf\n", triangle.a, triangle.b, triangle.c);
  24.     printf("三角形の面積: %.2lf\n", area);
  25.  
  26.     return 0;
  27. }
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 = 5.00, c = 5.00
三角形の面積: 10.83
https://ideone.com/icANSv
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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