逆波兰式
C#代码案例-逆波兰式计算器的开发源代码（超详细）
foreach (var op in matches)
{
index = op.Index;
if (gplist.Count == 0)
{
gplist.Add(op.ToString());
level++;
continue;
}
if (op.ToString() == ",")
{
if (gplist[0] == "(" && level == 0 || op.ToString() == "," && gplist[0] == ")" && level == -1)
paramdicti
