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  1. #include <stdio.h>
  2. #include<math.h>
  3. struct sankaku{
  4. 	double a;
  5. 	double b;
  6. 	double c;
  7. };
  8.  
  9.  
  10. int main(void) {
  11. 	struct sankaku 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("辺a = %.f\n", t.a);
  21.     printf("辺b = %.f\n", t.b);
  22.     printf("辺c = %.f\n", t.c);
  23.     printf("面積 s = %.6f\n", s);
  24.  
  25.  
  26.  
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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4
4
4
stdout
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辺a = 4
辺b = 4
辺c = 4
面積 s = 6.928203
https://ideone.com/hOiK8n
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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