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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void){
  5.     double a,b,c,s,area;
  6.  
  7.  
  8.     scanf("%lf",&a);
  9.     printf("a:%lf ",a);
  10.     scanf("%lf",&b);
  11.     printf("b:%lf ",b);
  12.     scanf("%lf",&c);
  13.     printf("c:%lf ",c);
  14.  
  15.     s=(a+b+c)/2;
  16.  
  17.     area=sqrt(s*(s-a)*(s-b)*(s-c));
  18.  
  19.     printf("三角形の面積:%lf\n",area);
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5276KB
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/TaAymI
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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