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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. 	double p,k,s;
  12. 	struct triangle A;
  13. 	scanf("%lf %lf %lf", &A.a, &A.b, &A.c);
  14.     p = (A.a + A.b + A.c) / 2; 
  15.     k = (p * (p - A.a) * (p - A.b) * (p - A.c));
  16.     s = sqrt(k);
  17.  
  18.     printf("a:%lf, b:%lf, c:%lf\n", A.a, A.b, A.c);
  19.     printf("三角形の面積: %f\n",s);
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5280KB
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/St7d2I
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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