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  1. #include<stdio.h>
  2. #include<math.h>
  3. int main()
  4. {
  5. double a,r,s,b,area;
  6. scanf("%lf %lf",&a,&r);
  7. s=a*a;
  8. b=3.14*r*r;
  9. area=s-b;
  10. printf("%lf",area);
  11. return 0;
  12. }
Success #stdin #stdout 0s 5432KB
comments (?)
stdin 
2
stdout 
4.000000
https://ideone.com/S0Vwx5
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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