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  1. #include <cmath>
  2. #include <iostream>
  3.  
  4. void solve(int sum, int mul)
  5. {
  6.     std::cout << "solution for x + y = " << sum << std::endl
  7.               << "             x * y = " << mul << std::endl;
  8.     const int delta = sum * sum - 4 * mul;
  9.     if (delta < 0) {
  10.         std::cout << "No solution" << std::endl;
  11.         return;
  12.     }
  13.     const float sqrtdelta = sqrtf(delta);
  14.     const float x1 = (sum + sqrtdelta) / 2.f;
  15.     const float x2 = (sum - sqrtdelta) / 2.f;
  16.  
  17.     std::cout << "x = " << x1 << ", y = " << sum - x1 << std::endl;
  18.     if (delta != 0) {
  19.         std::cout << "x = " << x2 << ", y = " << sum - x2 << std::endl;
  20.     }
  21. }
  22.  
  23. int main(int argc, char *argv[])
  24. {
  25.     solve(5, 6);   // 2, 3
  26.     solve(-5, 6);  // -2, -3
  27.     solve(5, -6);  // -1, 6
  28.     solve(-5, -6); // -6, 1
  29.     solve(2, 4); // No solution
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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solution for x + y = 5
             x * y = 6
x = 3, y = 2
x = 2, y = 3
solution for x + y = -5
             x * y = 6
x = -2, y = -3
x = -3, y = -2
solution for x + y = 5
             x * y = -6
x = 6, y = -1
x = -1, y = 6
solution for x + y = -5
             x * y = -6
x = 1, y = -6
x = -6, y = 1
solution for x + y = 2
             x * y = 4
No solution
https://ideone.com/qwrSwa
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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