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  1. #include <math.h>
  2. #include <stdio.h>
  3.  
  4. double enshu(double r)
  5. {
  6. 	return 2 * M_PI * r;
  7. }
  8.  
  9. double menseki(double &r)
  10. {
  11. 	return M_PI * r * r;
  12. }
  13.  
  14. int main()
  15. {
  16. 	double	r, ring, area;
  17.  
  18. 	printf("半径rを入力：\n");
  19. 	scanf("%lf", &r);
  20. 	ring = enshu(r);
  21. 	area = menseki(r);
  22. 	printf("円周：%f\n", ring);
  23. 	printf("面積：%f\n", area);
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 2684KB
comments (?)
stdin 
5
stdout 
半径rを入力：
円周：31.415927
面積：78.539816
https://ideone.com/Gp59j
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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