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POImaginary numbers in C#
 

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    <p>I'm trying to make a simple console-based program that can solve quadratic equations. I still haven't figured out how to calculate the answers if the discriminant is a negative number, so I just displayed a message as a placeholder. So can anybody explain how to do this? I'll post the whole program for any suggestions. Thanks.</p> <p>Properly working code (Thanks, Gunther Fox):</p> <pre><code>if(discriminant &lt; 0) { double x1 = -b/(2*a); discriminant = -discriminant ; double x2 = Math.Sqrt(discriminant)/(2*a); double x3 = -Math.Sqrt(discriminant)/(2*a); Console.WriteLine(x1.ToString() + " + " + x2.ToString() + " * i "); Console.WriteLine(x1.ToString() + " + " + x3.ToString() + " * i "); Console.ReadLine(); } </code></pre> <p>Old code:</p> <pre><code>class Program { static void Main(string[] args) { int choice; double ans1; double ans2; Console.WriteLine("~~~~~~~~ TERMINAL CALCULATOR ~~~~~~~~"); Console.WriteLine("1. Standard Calculator\n2. Quadratic Equation Solver\n3. Simple Interest Calculator"); choice = int.Parse(Console.ReadLine()); try { if (choice == 2) { Console.Write("Enter a value for 'a': "); double a = double.Parse(Console.ReadLine()); Console.Write("Enter a value for 'b': "); double b = double.Parse(Console.ReadLine()); Console.Write("Enter a value for 'c': "); double c = double.Parse(Console.ReadLine()); //Quadratic Formula: x = (-b +- sqrt(b^2 - 4ac)) / 2a //Solve disriminant: (b*b) - (4*a*c) double discriminant = (b * b) - (4 * a * c); if (discriminant &lt; 0) { Console.WriteLine("No real solutions"); Console.ReadLine(); } else { double sqrt = Math.Sqrt(discriminant); ans1 = (-b + sqrt) / (2 * a); ans2 = (-b - sqrt) / (2 * a); Console.WriteLine("{" + ans1 + " , " + ans2 + "}"); Console.ReadLine(); } } if (choice == 1) { Console.Write("Enter first number: "); double num1 = double.Parse(Console.ReadLine()); Console.Write("Enter second number (Enter 0 if you want to use sqrt): "); double num2 = double.Parse(Console.ReadLine()); //Prompt user to choose an operation Console.WriteLine("Choose a math operator:\n1. +\n2. -\n3. x\n4. /\n5. ^\n6. Square root"); int mathOpr = int.Parse(Console.ReadLine()); if (mathOpr == 1) { double answer = num1 + num2; Console.WriteLine("\n\n" + answer); Console.ReadLine(); } if (mathOpr == 2) { double answer = num1 - num2; Console.WriteLine("\n\n" + answer); Console.ReadLine(); } if (mathOpr == 3) { double answer = num1 * num2; Console.WriteLine("\n\n" + answer); Console.ReadLine(); } if (mathOpr == 4) { double answer = num1 / num2; Console.WriteLine("\n\n" + answer); Console.ReadLine(); } if (mathOpr == 5) { double answer = Math.Pow(num1, num2); Console.WriteLine("\n\n" + answer); Console.ReadLine(); } if (mathOpr == 6) { if (num1 &lt; 0) { Console.WriteLine("\n\nNo real solutions"); } else { double answer = Math.Sqrt(num1); Console.WriteLine("\n\n" + answer); } } else { Console.WriteLine("That is not a valid option, idiot."); Console.ReadLine(); } } if (choice == 3) { Console.WriteLine("Enter initial amount: "); double initAmount = double.Parse(Console.ReadLine()); Console.WriteLine("Enter interest rate (ex. 6% = .06): "); double rate = double.Parse(Console.ReadLine()); Console.WriteLine("Enter time range (Year, Month, Week, etc.): "); string timeRange = Console.ReadLine(); Console.WriteLine("Enter amount of " + timeRange.ToLower() + "s: "); int time = int.Parse(Console.ReadLine()); for (int time2 = 1; time2 &lt;= time; time2++) { double totalAmount = initAmount * Math.Pow(1 + rate, time2); Console.WriteLine("\n" + timeRange + " " + time2 + " ---------- " + totalAmount); } Console.ReadLine(); } } catch { Console.WriteLine("That is not a valid option."); } } } </code></pre>
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    1. COImaginary numbers or system generated numbers?
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    2. CO@bonCodigo: Imaginary numbers.
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    3. COcheckout this http://stackoverflow.com/questions/1452276/complex-number-notation also do a google search for Complex numbers with C# stackoverflow
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