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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.     scanf("%lf", &t.a);
  14.     scanf("%lf", &t.b);
  15.     scanf("%lf", &t.c);
  16.  
  17.     p = (t.a + t.b + t.c) / 2.0;
  18.     s = sqrt(p * (p - t.a) * (p - t.b) * (p - t.c));
  19.  
  20.     printf("\n入力した三角形の辺の長さ\n");
  21.     printf("a = %lf, b = %lf, c = %lf\n", t.a, t.b, t.c);
  22.     printf("三角形の面積: %lf\n", s);
  23.  
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5296KB
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stdin
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5
5
5
stdout
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入力した三角形の辺の長さ
a = 5.000000, b = 5.000000, c = 5.000000
三角形の面積: 10.825318
https://ideone.com/idNyhG
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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