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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. int main(void) {
  10.      struct triangle d;
  11.       scanf("%lf %lf %lf",&d.a,&d.b,&d.c);
  12.  
  13.       double p,s;
  14.  
  15.       p = (d.a+d.b+d.c)/2.0;
  16.       s = sqrt(p*(p-d.a)*(p-d.b)*(p-d.c));
  17.       printf("a:%lf\n",d.a);
  18.       printf("b:%lf\n",d.b);
  19.       printf("c:%lf\n",d.c);
  20.      printf("三角形の面積：%lf",s);
  21.       return 0;
  22. }
  23.  
  24.  
  25.  
Success #stdin #stdout 0s 5308KB
comments (?)
stdin
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5 5 5
stdout
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a:5.000000
b:5.000000
c:5.000000
三角形の面積：10.825318
https://ideone.com/Jw4zB1
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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