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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct hen{
  5. 	int a;
  6. 	int b;
  7. 	int c;
  8. };
  9.  
  10. int main(void) {
  11. 	struct hen sankakkei={3,4,5};
  12. 	double b;
  13. 	double s=(sankakkei.a+sankakkei.b+sankakkei.c)/2;
  14. 	b=sqrt(s*(s-sankakkei.a)*(s-sankakkei.b)*(s-sankakkei.c));
  15. 	printf("a:%d\n",sankakkei.a);
  16. 	printf("b:%d\n",sankakkei.b);
  17. 	printf("c:%d\n",sankakkei.c);
  18. 	printf("三角形の面積:%lf",b);
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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a:3
b:4
c:5
三角形の面積:6.000000
https://ideone.com/loX1R8
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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