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  1. #include <stdio.h>
  2.  
  3. double PI=3.14;
  4.  
  5. double circum_length(double r)
  6. {
  7. 	return 2*r*PI;
  8. }
  9.  
  10. double area(double r)
  11. {
  12. 	return r*r*PI;
  13. }
  14.  
  15. int main(void) {
  16.  
  17. 	double r;
  18. 	scanf("%lf",&r);
  19. 	printf("円周：%lf,面積：%lf",circum_length(r),area(r));
  20.  
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
3
stdout 
円周：18.840000,面積：28.260000
https://ideone.com/7c7GQv
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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