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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. }triangle;
  9.  
  10. int main(void) {
  11.  
  12. 	triangle t;
  13. 	double s; //半周長を定義
  14. 	double area;
  15.  
  16. 	scanf("%lf %lf %lf",&t.a,&t.b,&t.c);
  17. 	s=(t.a+t.b+t.c)/2;
  18. 	area = sqrt(s * (s - t.a) * (s - t.b) * (s - t.c));
  19.  
  20. 	printf("a:%f\nb:%f\nc:%f\n三角形の面積:%lf",t.a,t.b,t.c,area);
  21.  
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5312KB
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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/LGDLnp
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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