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  1. #include<stdio.h>
  2. #define pi 3.14;
  3. int main()
  4. {
  5. double r,area;
  6. scanf("%lf",&r);
  7. area=3.14*r*r;
  8. printf("%lf",area);
  9. return 0;
  10. }
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
2
stdout 
12.560000
https://ideone.com/vxaznO
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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