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  1.  
  2. #include<iostream>
  3. using namespace std;
  4. int main()
  5. {
  6. 	float r, area;
  7. 	cout<<"Enter radius: ";
  8. 	cin>>r;
  9. 	area=(2.0*3.14)*r;
  10. 	cout<<"Area: "<<area;
  11.  
  12. return 0;	
  13. }
Success #stdin #stdout 0s 16064KB
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Enter radius: Area: 18.84
https://ideone.com/LRSRio
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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