public void Add(string BtnStr)
{
ExprLegit = true;
if (haveCounted)
{
haveCounted = false;
ExprStr = "";
}
char [] op = BtnStr.ToCharArray();
if (IsOP(op[0]))
{
if (ExprStr.EndsWith("+") || ExprStr.EndsWith("-") || ExprStr.EndsWith("×") || ExprStr.EndsWith("÷"))
{
ExprStr = ExprStr.Remove(ExprStr.Length - 1);
}
}
if (BtnStr == "squa" || BtnStr == "cube" || BtnStr == "fact")
{
ExprStr = BtnStr + "(" + ExprStr + ")";
}
else
{
ExprStr = ExprStr + BtnStr;
}
}
public void BackSpace()
{
int pos = ExprStr.Length - 1;
if (pos >= 0)
{
ExprStr = ExprStr.Remove(pos);
}
}
public override bool Equals(object obj)
{
var other = obj as ExprDesc;
if (other == null)
{
return(false);
}
return(ExprStr.Equals(other.ExprStr));
}
public override int GetHashCode()
{
return(ExprStr.GetHashCode());
}
