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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 s;
  12.  scanf("%lf", &s.a);
  13.  scanf("%lf", &s.b);
  14.  scanf("%lf", &s.c);
  15.  double l=(s.a+s.b+s.c)/2;
  16.  double area=sqrt(l*(l-s.a)*(l-s.b)*(l-s.c));
  17.  
  18.  printf("a:%lf\n", s.a);
  19.  printf("b:%lf\n", s.b);
  20.  printf("c:%lf\n", s.c);
  21.  printf("三角形の面積:%lf\n", area);
  22.  return 0;
  23. }
Success #stdin #stdout 0.01s 5264KB
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/CXGeYO
language:
C99 (gcc 8.3)
created:
8 days ago
visibility:
public

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