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  1. // Test Case: Solve quadratic equations 
  2. // And throws variables that are either a is less than 0 or b2 is less than 0 
  3. #include <string>
  4. #include <iostream> 
  5. #include <cstdlib> 
  6. #include <cmath>
  7. #include <stdexcept>
  8.  
  9. void check_precondition(double a, double b, double c)
  10. {
  11.     std::string errors;
  12.  
  13.     if (a == 0)
  14.         errors += "a cannot be 0.";
  15.     else if (a < 0)
  16.         errors += "a cannot be negative.";
  17.  
  18.     if (b*b <= 4 * a*c)
  19.     {
  20.         if (!errors.empty())
  21.             errors += '\n';
  22.  
  23.         errors += "b squared must be greater than 4ac\n";
  24.     }
  25.  
  26.     if (!errors.empty())
  27.         throw std::runtime_error(errors);
  28. }
  29.  
  30. int main()
  31. {
  32.     double a, b, c;
  33.  
  34.     try {
  35.         std::cout << "Enter the three coefficients \n";
  36.         std::cin >> a >> b >> c;
  37.  
  38.         check_precondition(a, b, c);
  39.  
  40.         double discriminant = b*b - 4 * a*c;
  41.  
  42.         std::cout << "The two roots are: " << ((-b + std::sqrt(discriminant)) / (2 * a));
  43.         std::cout << " and " << ((-b + std::sqrt(discriminant)) / (2 * a)) << '\n';
  44.     }
  45.  
  46.     catch (std::exception& ex)
  47.     {
  48.         std::cout << "Problem encountered:\n" << ex.what() << '\n';
  49.         std::cout << "With a = " << a << ", b = " << b << ", c = " << c << '\n';
  50.         return 1;
  51.     }
  52. }
Runtime error #stdin #stdout 0s 3436KB
comments (?)
stdin
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-1 4 -100
stdout
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Enter the three coefficients 
Problem encountered:
a cannot be negative.
b squared must be greater than 4ac

With a = -1, b = 4, c = -100
https://ideone.com/5PUt0q
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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