I need help please.

[Waqar Ahmed]

#include<iostream>
#include<conio>
#include<cstring>

struct node	{
	int data;
	node* next;
};
class stack
{
	private:
   	node* top;
   public:
   	stack() : top(NULL) {}
   	bool isEmpty()
      	{
         if(top == NULL)
         	return true;
         }
      void push(int);
      int pop();
      int evaluate(string);
      void display();
};

void stack :: push(int i)
	{
   node* temp;
   temp = new node;
   temp->data = i;
   temp->next = top;
   top = temp;
   }
int stack :: pop()
	{
   if(top!=NULL){
   int i=0;
   node* temp = top;
   top = top->next;
   i = temp->data;
   delete temp;
   return i;
   }
   }

int stack :: evaluate(string exp)
	{
   char ch;
	int result = 0, i=0, temp1, temp2;
   while(exp[i] != '\0')
   	{
      switch(exp[i])
      	{
         case '1':
         case '2':
         case '3':
         case '4':
         case '5':
         case '6':
         case '7':
         case '8':
         case '9':
         case '0':
         	temp1 = exp[i] - '0';
         	push(temp1);
            display();        //for debugging purpose
            break;
      	case '/':
         	temp1 = pop();
            temp2 = pop();
            push( temp2 / temp1 );
            break;
         case '*':
         	push(pop()*pop());
            break;
         case '+':
         	push(pop()+pop());
            break;
         case '-':
         	temp1 = pop();
            temp2 = pop();
         	push(temp2 - temp1);
            break;
         default:
         	break;
         }
      i++;
      }

	}
void stack :: display()
	{
   node* temp = top;
   for(; temp!=NULL; temp=temp->next)
   	cout<<temp->data<<endl;
     getch();
   }

void main()
	{
   string exp = "52+3-";
   stack s;
   s.evaluate(exp);
   int i = s.pop();
   cout<<"I :- " <<i<<endl;
   s.display();
   getch();

   }

I dont know whats the problem in this code. I have been looking at it for the last 1 hour. It gives "Abnormal Program Termination" error. I took the output at several points. Its okay until 5 and 2 are added. But terminates before subtracting 7 and 3.
Please help.

[Fransje]

Possible solution: change void main() to int main( int argc, char* argv[] ) and add return 0; after getch();