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  1. #include <bits/stdc++.h>
  2. #include <math.h>
  3. #include <iomanip>
  4. using namespace std;
  5. int main()
  6. {
  7.     double a,b;
  8.     cin>>a>>b;
  9.     double c, pi;
  10.     pi = atan2(0,-1);
  11.     c = atan(b/a);
  12.     if (c<0) c+=2*pi;
  13.     cout<< fixed<< setprecision(8)<< c;
  14.     return 0;
  15. }
Success #stdin #stdout 0s 16064KB
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0.92729522
https://ideone.com/LyPuF5
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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