private void ToSimpleBut_Click(object sender, EventArgs e)
{
Fraction fr = Calculations.ToSimpleFraction(Convert.ToDouble(MainTextBox.Text));
SimpFCheckBox.Checked = true;
MainTextBox.Text = fr.ToString();
}
// Function to calculate an expression with simple fractions.
public static string SimpFracCalcAll(string s)
{
// Find and calculate brackets.
s = CalculateBrackets(s);
// Multiplicate.
s = SimpMult(s);
// Addition and subtraction
s = SimpAddAndSub(s);
if (s.IndexOf('*') == -1 && s.IndexOf('+') == -1 && s.IndexOf('-') == -1 &&
s.IndexOf('(') == -1 && s.IndexOf(')') == -1)
{
// Creating a fraction object in oerder to get rid of several /.
Fraction fr = new Fraction();
if (CreateFraction(s, ref fr))
{
if (fr.Denominator != 1 && fr.Denominator != -1)
{
s = fr.ToString();
}
else
{
if (fr.Denominator == -1)
{
s = "-" + fr.Numerator.ToString();
}
else
{
s = fr.Numerator.ToString();
}
}
}
else
{
s = "Cannot be calculated!";
}
}
return(s);
}
public static string SimpSub(string s)
{
// If there is subtraction.
if (s.IndexOf('-') != -1)
{
// Index of the multiplication sign.
int multIndex = s.IndexOf('-');
// The minuend.
string X = "";
// The subtrahend.
string Y = "";
// Index that finds the minuend.
int startIndex = multIndex - 1;
// Getting the minuend.
while (startIndex > -1 && (Char.IsDigit(s[startIndex]) ||
s[startIndex] == '/' || (startIndex == 0 && s[startIndex] == '-')))
{
X = s[startIndex] + X;
startIndex--;
}
// Index that finds the subtrahend.
int endIndex = multIndex + 1;
// Getting the subtrahend.
while (endIndex < s.Length && (Char.IsDigit(s[endIndex]) ||
s[endIndex] == '/' || (endIndex == multIndex + 1 && s[endIndex] == '-')))
{
Y += s[endIndex];
endIndex++;
}
// Creating buffers for future fractions.
Fraction xFrac = new Fraction();
Fraction yFrac = new Fraction();
if (X != "" && Y != "")
{
// If both can be fractions then calcualte and add to the original string.
if (CreateFraction(X, ref xFrac) && CreateFraction(Y, ref yFrac))
{
string result = Calculations.Minus(xFrac, yFrac).ToString();
s = s.Substring(0, startIndex + 1) + result + s.Substring(endIndex, s.Length - endIndex);
}
else
{
MessageBox.Show("Input error!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
s = "Cannot be calculated!";
return(s);
}
}
else
{
if (X == "")
{
if (CreateFraction(Y, ref yFrac))
{
s = "-" + yFrac.ToString();
}
else
{
MessageBox.Show("Input error!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
s = "Cannot be calculated!";
return(s);
}
}
else
{
s = X;
}
}
}
return(s);
}