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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 t;
  12.  
  13.     double x;
  14.     double s;
  15.  
  16.   scanf("%lf",&t.a);
  17.   scanf("%lf",&t.b);
  18.   scanf("%lf",&t.c);
  19.     x = (t.a + t.b + t.c) / 2.0;
  20.  
  21.     s = sqrt(x * (x - t.a) * (x - t.b) * (x - t.c));
  22.  
  23.     printf("a : %0.lf\n", t.a);
  24.     printf("b : %0.lf\n", t.b);
  25.     printf("c : %0.lf\n", t.c);
  26.     printf("三角形の面積 : %f\n", s);
  27.  
  28.     return 0;
  29. }
  30.  
  31.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
5
5
5
stdout 
a : 5
b : 5
c : 5
三角形の面積 : 10.825318
https://ideone.com/N8fbYc
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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