static bool IsSymmetry(char[] xx) //判断是否为中心对称串的函数
{
int leng = xx.Length + 1;
MyStack <char> exam1 = new MyStack <char>(leng);
int a = xx.Length % 2;
if (a == 0)
{
for (int i = 0; i < xx.Length; i++)
{
if (i == 0 || (i > 0 && xx[i] != exam1.GetTop()))
{
exam1.Push(xx[i]);
}
else
{
exam1.Pop();
}
}
}
else
{
for (int i = 0; i < xx.Length; i++)
{
if (i == (xx.Length - 1) / 2)
{
continue;
}
else if (i == 0 || (i > 0 && xx[i] != exam1.GetTop()))
{
exam1.Push(xx[i]);
}
else
{
exam1.Pop();
}
}
}
if (exam1.IsEmpty())
{
return(true);
}
else
{
return(false);
}
}
public string To26System() //转化为26进制
{
string show = "";
MyStack <int> exam = new MyStack <int>(Num.Length);
int[] tt = Num;
while (!IsZero(NumDivide26(tt)))
{
exam.Push(NumMod26(tt));
tt = NumDivide26(tt);
}
exam.Push(NumMod26(tt));
for (int i = exam.Top; i < exam.Bottom; i++)
{
show += ExpressionOf26System(exam.Pop());
}
return(show);
}
public double PostExpressionStackCompute() //后缀表达式求值
{
char[] bb = postExpression.ToCharArray();
int y = 0;
for (int i = 0; i < bb.Length; i++)
{
if (bb[i] != '\0')
{
y++;
}
}
char[] aa = new char[y];
for (int i = 0; i < aa.Length; i++)
{
aa[i] = bb[i];
}
int leng = aa.Length + 1;
MyStack <double> save = new MyStack <double>(leng);
double result = 0;
for (int i = 0; i < aa.Length; i++)
{
if (CharJuddging(aa[i]) == "OPD")
{
save.Push(CharToInt(aa[i]));
}
else
{
double qq = save.Pop();
double ww = save.Pop();
save.Push(Operate(aa[i], ww, qq));
}
}
result = save.Pop();
return(result);
}
