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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     double a;
  6.     double b;
  7.     double c;
  8. } Triangle;
  9.  
  10. int main() {
  11.     Triangle triangle;
  12.     double p;
  13.     double area;
  14.  
  15.     printf("三角形の辺aを入力してください: ");
  16.     scanf("%lf", &triangle.a);
  17.     printf("三角形の辺bを入力してください: ");
  18.     scanf("%lf", &triangle.b);
  19.     printf("三角形の辺cを入力してください: ");
  20.     scanf("%lf", &triangle.c);
  21.  
  22.     p = (triangle.a + triangle.b + triangle.c) / 2.0;
  23.     area = sqrt(p * (p - triangle.a) * (p - triangle.b) * (p - triangle.c));
  24.  
  25.     printf("a = %.2lf, b = %.2lf, c = %.2lf\n", triangle.a, triangle.b, triangle.c);
  26.     printf("三角形の面積: %.2lf\n", area);
  27.  
  28.     return 0;
  29. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin 
5
5
5
stdout 
三角形の辺aを入力してください: 三角形の辺bを入力してください: 三角形の辺cを入力してください: a = 5.00, b = 5.00, c = 5.00
三角形の面積: 10.83
https://ideone.com/Fk70J9
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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