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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 t;
  12.     double p, s;
  13.  
  14.     scanf("%lf", &t.a);
  15.  
  16.     scanf("%lf", &t.b);
  17.  
  18.     scanf("%lf", &t.c);
  19.  
  20.  
  21.     p = (t.a + t.b + t.c) / 2.0;
  22.     s = sqrt(p * (p - t.a) * (p - t.b) * (p - t.c));
  23.  
  24.  
  25.     printf("a : %.0f\nb : %.0f\nc : %.0f\n", t.a, t.b, t.c);
  26.     printf("三角形の面積: %f\n", s);
  27.  
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin
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5 5 5
stdout
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a : 5
b : 5
c : 5
三角形の面積: 10.825318
https://ideone.com/N4mApR
language:
C (gcc 8.3)
created:
14 hours ago
visibility:
public

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