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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. }tri;
  9.  
  10. int main(void) {
  11.  
  12. 	tri data={0};
  13. 	double p;
  14. 	double s;
  15.  
  16. 	scanf("%lf",&data.a);
  17. 	scanf("%lf",&data.b);   //doubleの入力受け取り時は%lfでないといけない
  18. 	scanf("%lf",&data.c);
  19.  
  20. 	p=(data.a+data.b+data.c)/2;
  21. 	s=sqrt(p*(p-data.a)*(p-data.b)*(p-data.c));
  22.  
  23. 	printf("%f",s);
  24.  
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5296KB
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10.825318
https://ideone.com/lQTJRo
ヘロンの公式
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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