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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct{
  5. 	double a;
  6. 	double b;
  7. 	double c;
  8. }hen;
  9.  
  10. int main(void){
  11.  
  12. 	hen t;
  13. 	double p,s,x;
  14.  
  15. 	scanf("%lf %lf %lf",&t.a,&t.b,&t.c);
  16.  
  17. 	p=(t.a+t.b+t.c)/2;
  18. 	x=p*(p-t.a)*(p-t.b)*(p-t.c);
  19. 	s=sqrt(x);
  20.  
  21. 	printf("a: %lf\n",t.a);
  22. 	printf("b: %lf\n",t.b);
  23. 	printf("c: %lf\n",t.c);
  24. 	printf("三角形の面積: %lf",s);
  25.  
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 5288KB
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/dK4L10
language:
C (gcc 8.3)
created:
20 hours ago
visibility:
public

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