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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. double calculate_area(Triangle t) {
  11. 	double a=t.a;
  12. 	double b=t.b;
  13. 	double c=t.c;
  14.  
  15.     double s = (a +b + c) / 2.0;
  16.     return sqrt(s * (s - a) * (s - b) * (s - c));
  17. }
  18.  
  19. int main(void) {
  20.     Triangle triangle;
  21.     double area;
  22.  
  23.     scanf("%lf", &triangle.a);
  24.     scanf("%lf", &triangle.b);
  25.     scanf("%lf", &triangle.c);
  26.  
  27.     area = calculate_area(triangle);
  28.  
  29.     printf("a：%.0f\n", triangle.a);
  30.     printf("b：%.0f\n", triangle.b);
  31.     printf("c：%.0f\n", triangle.c);
  32.     printf("三角形の面積：%.6lf\n", area);
  33.  
  34.     return 0;
  35. }
Success #stdin #stdout 0s 5296KB
comments (?)
stdin
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5
5
5
stdout
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a：5
b：5
c：5
三角形の面積：10.825318
https://ideone.com/KYLi2y
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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