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  1. #include <stdio.h>
  2. #include<math.h>
  3. struct HEN{
  4. 	double a;
  5. 	double b;
  6. 	double c;
  7. };
  8.  
  9. int main(void) {
  10. 	double s;
  11. 	double H;
  12. 	struct HEN sankakukei ={1,1,4};
  13. 	H=(sankakukei.a+sankakukei.b+sankakukei.c)/2;
  14. 	s=sqrt(H*(H-sankakukei.a)*(H-sankakukei.b)*(H-sankakukei.c));
  15. 	printf("a:%f \nb:%f \nc:%f \n三角形の面積:%f",sankakukei.a,sankakukei.b,sankakukei.c,s);
  16.  
  17. 	if (sankakukei.a + sankakukei.b <= sankakukei.c ||
  18.     sankakukei.a + sankakukei.c <= sankakukei.b ||
  19.     sankakukei.b + sankakukei.c <= sankakukei.a) {
  20.     printf("\n三角形になりません");
  21.  
  22. }
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0.01s 5252KB
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stdin
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Standard input is empty
stdout
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a:1.000000 
b:1.000000 
c:4.000000 
三角形の面積:-nan
三角形になりません
https://ideone.com/CX5S9K
language:
C99 (gcc 8.3)
created:
3 days ago
visibility:
public

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