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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.     scanf("%lf", &triangle.a);
  14.     scanf("%lf", &triangle.b);
  15.     scanf("%lf", &triangle.c);
  16.  
  17.     double p = (triangle.a + triangle.b + triangle.c) / 2.0;
  18.     double s = sqrt(p * (p - triangle.a) * (p - triangle.b) * (p - triangle.c));
  19.  
  20.     printf("a : %lf\n", triangle.a);
  21.     printf("b : %lf\n", triangle.b);
  22.     printf("c : %lf\n", triangle.c);
  23.     printf("三角形の面積 : %lf\n", s);
  24.  
  25.     return 0;
  26. }
  27.  
  28.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin 
5
5
5
stdout 
a : 5.000000
b : 5.000000
c : 5.000000
三角形の面積 : 10.825318
https://ideone.com/yS1NAN
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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