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  1. #include <stdio.h>
  2. #include <math.h>
  3. typedef struct tri{
  4.     double a;
  5.     double b;
  6.     double c;
  7. } Tri;
  8. void display(Tri *t){
  9.     printf("a = %f\n", t->a);
  10.     printf("b = %f\n", t->b);
  11.     printf("c = %f\n", t->c);
  12. }
  13. double heron(Tri *t){
  14.     double p;
  15.     p = (t->a + t->b + t->c) / 2;
  16.     return sqrt(p* (p - t->a) * (p - t->b) * (p - t->c));
  17. }
  18. int main(void){
  19.     Tri t;
  20.     scanf("%lf", &t.a);
  21.     scanf("%lf", &t.b);
  22.     scanf("%lf", &t.c);
  23.     display(&t);
  24.     printf("三角形の面積 ： %f\n", heron(&t));
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0s 5280KB
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/Y5ch4k
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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