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  1. #include <stdio.h>
  2. #include <math.h>
  3. typedef struct{
  4. 		double a;
  5. 		double b;
  6. 		double c;
  7. 	} Tri;
  8. int main(void) {
  9. 	Tri data={0};
  10. 	scanf("%lf %lf %lf",&data.a,&data.b,&data.c);
  11. 	printf("a:%lf b:%lf c:%lf\n",data.a,data.b,data.c);
  12. 	double s;
  13. 	double p;
  14. 	p=(data.a+data.b+data.c)/2;
  15. 	s=sqrt(p*(p-data.a)*(p-data.b)*(p-data.c));
  16. 	printf("三角形の面積:%lf",s);
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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5 5 5
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/VeicZf
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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