How can I pop something by reference?

Question

I am doing a program to check for balanced brackets and parenthesis, etc. I created a char to store the info, and when I push the char it works, but it won't allow me to pop. Anyone know what I can do? Our prof gave us the header file so I cannot change it from int to char in the pop/push function. But I'm curious what I can do to make this work?

void push(int);
void pop(int &);

char ch,i;
IntStack x(50);
int count = 0;

while (fin>>ch)
{
if (ch == '[' || ch=='{' || ch=='(')
{
      x.push(ch);    //this works
  count++;
}

if (ch==']' || ch=='}' || ch==')')
{
  x.pop(ch);    //this brings an error, i also tried x.pop(ch&) and didnt work too
  count--;
}

}

Answer 1

You cannot bind a char to a non-const reference to int. Change the type of ch to int and you should be fine.

Answer 2

Pass an integer into pop that represents ch, then set ch according the results passed back from the integer.

int PopVar;
Pop(PopVar);
ch = PopVar;