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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4.  
  5. struct triangle{
  6. 	double a;
  7. 	double b;
  8. 	double c;
  9. };
  10.  
  11. int main(void) {
  12. 	struct triangle sankaku = {0,0,0};
  13.  
  14. 	scanf("%lf",&sankaku.a);
  15. 	scanf("%lf",&sankaku.b);
  16. 	scanf("%lf",&sankaku.c);
  17.  
  18. 	double p,n;
  19. 	double s;
  20.  
  21. 	p = (sankaku.a+sankaku.b+sankaku.c)/2;
  22. 	n = p*(p-sankaku.a)*(p-sankaku.b)*(p-sankaku.c);
  23. 	s = sqrt(n);
  24.  
  25. 	printf("a = %lf \n",sankaku.a);
  26. 	printf("b = %lf \n",sankaku.b);
  27. 	printf("c = %lf \n",sankaku.c);
  28. 	printf("三角形の面積 = %lf \n",s);
  29.  
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
5 5 5
stdout 
a = 5.000000 
b = 5.000000 
c = 5.000000 
三角形の面積 = 10.825318
https://ideone.com/UAZdR0
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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