我的平方根 C# 程序仅在判别式为 0 或小于 0 时有效,但在大于 0 时无效
My c# program for square roots only works when the discriminant is 0 or less than 0, but not when it's greater than 0
private void btnCompute_Click(object sender, EventArgs e)
{
double coefficientA;
double coefficientB;
double coefficientC;
double root1;
double root2;
double discriminant;
coefficientA = double.Parse(txtCoeA.Text);
coefficientB = double.Parse(txtCoeB.Text);
coefficientC = double.Parse(txtCoeC.Text);
discriminant =
(coefficientB * coefficientB) -
(4 * coefficientA * coefficientC);
txtOutput.Text = "Discriminant = " + discriminant.ToString("N2");
//-b/2a
root1 = (-coefficientB + discriminant) / (2 * coefficientA);
root2 = (-coefficientB - discriminant) / (2 * coefficientA);
if (discriminant < 0)
{
txtOutput.Text += "\r\nEquation has no real roots!";
}
else if (discriminant == 0)
{
txtOutput.Text +=
"\r\nEquation has one root: " + root2.ToString("N2");
}
else if (discriminant > 0)
{
txtOutput.Text = "Equation has two real roots: " +
"\r\nroot1: " +
(-coefficientB + Math.Sqrt(discriminant) /
(2 * coefficientA)) +
"\r\nroot2: " + (coefficientB - Math.Sqrt(discriminant) /
(2 * coefficientA));
}
}
试试这个:
txtOutput.Text = "Equation has two real roots: " +
"\r\nroot1: " +
(-coefficientB + Math.Sqrt(discriminant)) / (2 * coefficientA) +
"\r\nroot2: " +
(-coefficientB - Math.Sqrt(discriminant)) / (2 * coefficientA);
你把公式括起来不正确。
private void btnCompute_Click(object sender, EventArgs e)
{
double coefficientA;
double coefficientB;
double coefficientC;
double root1;
double root2;
double discriminant;
coefficientA = double.Parse(txtCoeA.Text);
coefficientB = double.Parse(txtCoeB.Text);
coefficientC = double.Parse(txtCoeC.Text);
discriminant =
(coefficientB * coefficientB) -
(4 * coefficientA * coefficientC);
txtOutput.Text = "Discriminant = " + discriminant.ToString("N2");
//-b/2a
root1 = (-coefficientB + discriminant) / (2 * coefficientA);
root2 = (-coefficientB - discriminant) / (2 * coefficientA);
if (discriminant < 0)
{
txtOutput.Text += "\r\nEquation has no real roots!";
}
else if (discriminant == 0)
{
txtOutput.Text +=
"\r\nEquation has one root: " + root2.ToString("N2");
}
else if (discriminant > 0)
{
txtOutput.Text = "Equation has two real roots: " +
"\r\nroot1: " +
(-coefficientB + Math.Sqrt(discriminant) /
(2 * coefficientA)) +
"\r\nroot2: " + (coefficientB - Math.Sqrt(discriminant) /
(2 * coefficientA));
}
}
试试这个:
txtOutput.Text = "Equation has two real roots: " +
"\r\nroot1: " +
(-coefficientB + Math.Sqrt(discriminant)) / (2 * coefficientA) +
"\r\nroot2: " +
(-coefficientB - Math.Sqrt(discriminant)) / (2 * coefficientA);
你把公式括起来不正确。