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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     double a;
  6.     double b;
  7.     double c;
  8.     double area;
  9. } list;
  10.  
  11. int main(void) {
  12.  
  13.     list date;
  14.  
  15.     scanf("%lf", &date.a);
  16.  
  17.     scanf("%lf", &date.b);
  18.  
  19.     scanf("%lf", &date.c);
  20.  
  21.     double s = (date.a + date.b + date.c) / 2.0;
  22.  
  23.     date.area = sqrt(s * (s - date.a) * (s - date.b) * (s - date.c));
  24.  
  25.     printf("a : %lf\n", date.a);
  26.     printf("b : %lf\n", date.b);
  27.     printf("c : %lf\n", date.c);
  28.     printf("三角形の面積 : %lf\n", date.area);
  29.  
  30.     return 0;
  31. }
Success #stdin #stdout 0s 5280KB
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/h3rsi4
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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