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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.     int a,b,c;
  7.     double d;
  8.     cin >> a >> b >> c;
  9.     d = b*b - 4 * a * c;
  10.     if(a==0 && b==0 && c==0){
  11.         return cout << -1,0;
  12.     }
  13.     if(a==0)
  14.         return cout << 1 << '\n' << fixed << setprecision(6) << -double(c)/double(b),0;
  15.     if(d<0){
  16.         cout << 0;
  17.     } else {
  18.         if(d==0){
  19.             cout << 1 << fixed << setprecision(6) << -double(b)/(2.0*double(a));
  20.         } else {
  21.             d = sqrt(d);
  22.             cout << 2 << '\n' << fixed << setprecision(6) << (-double(b)+d)/(2.0*double(a))
  23.                                                 << '\n' << (-double(b)-d)/(2.0*double(a));
  24.         }
  25.     }
  26.  
  27. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
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1 -3 2
stdout
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2
2.000000
1.000000
https://ideone.com/lD2DJN
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
secret

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