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  1. #include <stdio.h>
  2. #include <math.h>
  3. struct Triangle{
  4.     double a;
  5.     double b;
  6.     double c;
  7. };
  8. int main(void) {
  9.     struct Triangle t;
  10.     double p,s;
  11.     scanf("%lf",&t.a);
  12.     scanf("%lf",&t.b);
  13.     scanf("%lf",&t.c);
  14.     p=(t.a+t.b+t.c)/2.0;
  15.     s=sqrt(p*(p-t.a)*(p-t.b)*(p-t.c));
  16.     printf("a:%d\n", (int)t.a);
  17.     printf("b:%d\n", (int)t.b);
  18.     printf("c:%d\n", (int)t.c);
  19.     printf("三角形の面積:%f\n",s);
  20.     return 0;
  21. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
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5
5
5
stdout
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a:5
b:5
c:5
三角形の面積:10.825318
https://ideone.com/l64mSa
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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