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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. 	double s;
  12. 	double area;
  13. 	struct triangle x={5};
  14. 	struct triangle y={5};
  15. 	struct triangle z={5};
  16.  
  17. 	s=(x.a+y.b+z.c)/2;
  18.     area=sqrt(s*(s-x.a)*(s-y.b)*(s-z.c));
  19.  
  20. 	printf("a: %lf\n",x.a);
  21.     printf("b: %lf\n",y.b);
  22.     printf("c: %lf\n",z.c);
  23.     printf("三角形の面積: %f\n", area);
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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a: 5.000000
b: 0.000000
c: 0.000000
三角形の面積: -nan
https://ideone.com/n6iJBb
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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