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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct sankaku{
  5. 	double a;
  6. 	double b;
  7. 	double c;
  8. };
  9.  
  10. int main(void) {
  11. 	struct sankaku data = { 5 , 5 , 5  };
  12. 	double p = (data.a+data.b+data.c)/2;
  13. 	double x = p*(p-data.a)*(p-data.b)*(p-data.c); 
  14. 	double s = sqrt( x );
  15. 	printf("a:%f\n",data.a);
  16. 	printf("b:%f\n",data.b);
  17. 	printf("c:%f\n",data.c);
  18. 	printf("三角形の面積:%f",s);
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 5276KB
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stdin
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Standard input is empty
stdout
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a:5.000000
b:5.000000
c:5.000000
三角形の面積:10.825318
https://ideone.com/uJW6ox
language:
C (gcc 8.3)
created:
5 hours ago
visibility:
public

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