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  1. #include <stdio.h>
  2. int main()
  3. {
  4.     double pi = 3.14159;
  5.     double r; scanf("%lf", &r);
  6.     if(r <= 0){
  7.       printf("ERROR");
  8.       return 0;
  9.     }
  10.     double x = 2.0 * r * pi;
  11.     printf("%lf\n", x);
  12.     printf("%lf", pi * r * r);
  13. }
Success #stdin #stdout 0s 5284KB
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6.283180
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https://ideone.com/SDAOCl
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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