static void Main(string[] args)
{
Console.WriteLine("Nhap chuoi");
string chuoi = Console.ReadLine();
string[] input = chuoi.Split(" ", StringSplitOptions.None);
ListStack st = new ListStack();
Console.WriteLine("Ket qua = {0}", YeuCau(input, st));
Console.ReadKey();
}
static int YeuCau(string[] chuoi, ListStack st)
{
int kq = 0;
for (int i = 0; i != chuoi.Length; i++)
{
if (chuoi[i] != " " && chuoi[i] != "+" && chuoi[i] != "-" && chuoi[i] != "*" && chuoi[i] != "/")
{
int.TryParse(chuoi[i], out int iX);
st.Push(iX);
}
if (chuoi[i] == "+")
{
int x = st.Pop();
int y = st.Pop();
kq = x + y;
st.Push(kq);
}
if (chuoi[i] == "-")
{
int x = st.Pop();
int y = st.Pop();
kq = x - y;
st.Push(kq);
}
if (chuoi[i] == "*")
{
int x = st.Pop();
int y = st.Pop();
kq = x * y;
st.Push(kq);
}
if (chuoi[i] == "/")
{
int x = st.Pop();
int y = st.Pop();
kq = x / y;
st.Push(kq);
}
}
return(st.Peek());
}