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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct tri {
  5. 	double x;
  6. 	double y;
  7. 	double z;
  8. };
  9.  
  10. int main(void) {
  11.  
  12. 	struct tri t = {5,5,5};
  13.  
  14. 	printf("%lf\n%lf\n%lf\n",t.x,t.y,t.z);
  15.  
  16. 	double p = ( t.x+t.y+t.z )/2.0;
  17. 	double s = sqrt(p*(p-t.x)*(p-t.y)*(p-t.z));
  18.  
  19. 	printf("面積：%lf",s);
  20.  
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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5.000000
5.000000
5.000000
面積：10.825318
https://ideone.com/QoR4Ce
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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