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  1. #include <stdio.h>
  2. #include <math.h> 
  3.  
  4.  
  5. struct Triangle {
  6.     double a;
  7.     double b;
  8.     double c;
  9. };
  10.  
  11. int main(void) {
  12.     struct Triangle tri; 
  13.     double p,s;
  14.  
  15.  
  16.     scanf("%lf", &tri.a);
  17.     scanf("%lf", &tri.b);
  18.     scanf("%lf", &tri.c);
  19.  
  20.  
  21.     p = (tri.a + tri.b + tri.c) / 2.0;
  22.  
  23.     s = sqrt(p* (p - tri.a) * (p - tri.b) * (p - tri.c));
  24.  
  25.     printf("三角形の面積 : %f\n", s);
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5288KB
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stdin
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4 4 4
stdout
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三角形の面積 : 6.928203
https://ideone.com/yILXz0
language:
C99 (gcc 8.3)
created:
8 hours ago
visibility:
public

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