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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct triangle{
  5. 	double a;
  6. 	double b;
  7. 	double c;
  8. };
  9.  
  10. int main(void) {
  11. 	struct triangle s;
  12. 	scanf("%lf", &s.a);
  13. 	scanf("%lf", &s.b);
  14. 	scanf("%lf", &s.c);
  15. 	double l=(s.a+s.b+s.c)/2;
  16. 	double area=sqrt(l*(l-s.a)*(l-s.b)*(l-s.c));
  17.  
  18. 	printf("a:%lf\n", s.a);
  19. 	printf("b:%lf\n", s.b);
  20. 	printf("c:%lf\n", s.c);
  21. 	printf("三角形の面積:%lf\n", area);
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin 
3
4
5
stdout 
a:3.000000
b:4.000000
c:5.000000
三角形の面積:6.000000
https://ideone.com/ubnFEl
language:
C99 (gcc 8.3)
created:
11 days ago
visibility:
public

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