public int Calculate2(string input)
{
input = input.Replace(" ", "");
for (int i = 0; i <= input.Length; i++)
{
if (i == input.Length || input [i] == '+' || input [i] == '-' || input [i] == '*' || input[i] == '/')
{
if (!stack.Empty() && (i == input.Length || input[i] == '*' || input[i] == '/') &&
(stack.Top() == '*' || stack.Top() == '/'))
{
char op = stack.Pop();
int val2 = result.Pop();
int val1 = result.Pop();
switch (op)
{
case '*':
result.Push(val1 * val2);
break;
case '/':
result.Push(val1 / val2);
break;
}
}
while (!stack.Empty() && (i == input.Length || input[i] == '+' || input[i] == '-'))
{
char op = stack.Pop();
int val2 = result.Pop();
int val1 = result.Pop();
switch (op)
{
case '+':
result.Push(val1 + val2);
break;
case '-':
result.Push(val1 - val2);
break;
case '*':
result.Push(val1 * val2);
break;
case '/':
result.Push(val1 / val2);
break;
}
}
if (i < input.Length)
{
stack.Push(input [i]);
}
}
else
{
result.Push(ReadInteger(input, i, out i));
}
}
return(result.Pop());
}
