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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. } Triangle;
  9.  
  10. int main(void) {
  11.     Triangle t = {5, 5, 5};
  12.     double s, S;
  13.  
  14.     s = (t.a + t.b + t.c) / 2.0;
  15.     S = sqrt(s * (s - t.a) * (s - t.b) * (s - t.c));
  16.  
  17.     printf("a: %f\n", t.a);
  18.     printf("b: %f\n", t.b);
  19.     printf("c: %f\n", t.c);
  20.     printf("三角形の面積：%lf\n", S);
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0s 5276KB
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stdin
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Standard input is empty
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/ImlmOo
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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