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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct side{
  5. 	int a;
  6. 	int b;
  7. 	int c;
  8. };
  9.  
  10. int main(void) {
  11. 	struct side sankaku={5,5,5};
  12.  
  13. 	double s,K;
  14.  
  15. 	s=(sankaku.a+sankaku.b+sankaku.c)/2.0;
  16.  
  17. 	K=sqrt(s*(s-sankaku.a)*(s-sankaku.b)*(s-sankaku.c));
  18.  
  19. 	printf("a:%d\n",sankaku.a);
  20. 	printf("b:%d\n",sankaku.b);
  21. 	printf("c:%d\n",sankaku.c);
  22. 	printf("三角形の面積:%lf\n",K);
  23.  
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5260KB
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stdin
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Standard input is empty
stdout
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a:5
b:5
c:5
三角形の面積:10.825318
https://ideone.com/b5UoP5
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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