Quadratic equation solver

Input Variables

Output Variables

Program Code

Description

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Input Variables List

Output Variables List

Source Code

double m = b * b - 4 * a * c;
if (a == 0)
{
   x1 = "a can not be zero";
   x2 = "a can not be zero";
}
else if (Math.Abs(m) < 1e-12)
    x1 = x2 = -b / 2 / a;
else if (m > 0)
{
    x1 = (-b + Math.Sqrt(m)) / 2 / a;
    x2 = (-b - Math.Sqrt(m)) / 2 / a;
}
else
{
   string i;
   if (Math.Abs(Math.Sqrt(-m) / 2 / Math.Abs(a) - 1) < 1e-12)
      i = "";
   else
      i  = Convert.ToString(Math.Sqrt(-m) / 2 / Math.Abs(a));
   if (b != 0)
   {
      x1 = Convert.ToString(-b / 2.0 / a) + " + " + i + "i";
      x2 = Convert.ToString(-b / 2.0 / a) + " - " + i + "i";
   }
   else
   {
     x1 = i + "i";
     x2 = "-" + i + "i";
   }
}

Subject

Description

This program calculates the two roots of the quadratic equation:
ax² + bx + c = 0

Category Mathematics

Created By zizo0003

Created Date 5/1/2011

Last Modify Date 5/1/2011

Calculation Count 17

Version 1.00

Positive 0

Neutral 0

Negative 0

Related Program ID 147 , 148