c++ Program for Infix to Prefix Conversion

#include<iostream.h>
#include<process.h>
#include<string.h>
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>
class stack
{
   double x[10],TOP_p,TOP_e,TOP_s,i,j,t;
   char exp[10][10],p[10][10],stack[10][10];
   public:
   stack();
   void pop();
   void push();
   double check();
   void intopre();
   void show();
};
stack::stack()
{
  TOP_p=TOP_s=TOP_e=0;
}
void stack::pop()
{
  if(TOP_s<1)
  {
    cout<<"\nSORRY!Stack Underflow....";
    exit(0);
  }
  TOP_p++;
  strcpy(p[TOP_p],stack[TOP_s]);
  TOP_s--;
  cout<<"\nElement in Polish.:\t";
  for(int t=TOP_p;t>=1;t--)
  cout<<"  "<<p[t];
}
void stack::push()
{
  if(TOP_s==10)
  {
    cout<<"\nSORRY!Stack Overflow....";
    exit(0);
  }
  TOP_s++;
  strcpy(stack[TOP_s],exp[TOP_e]);
  TOP_e--;
  cout<<"\nElement in Stack.:\t";
  for(int t=1;t<=TOP_s;t++)
  cout<<"  "<<stack[t];
}
double stack::check()
{
   double s,e,t;
   //stack[st]   Vs    exp[et]
   if(TOP_s<1)return 1;
  switch(stack[TOP_s][0])
  {
    case '^':
    s=3;
    break;
    case '*':
    case '/':
    s=2;
    break;
    case '+':
    case '-':
    s=1;
    break;
    default:
    s=4;
  }
  switch(exp[TOP_e][0])
  {
    case '^':
    e=3;
    break;
    case '*':
    case '/':
    e=2;
    break;
    case '+':
    case '-':
    e=1;
    break;
    default:
    e=4;
  }
  if(e>=s) return 1;       //push
  else return 0;          //pop
}
void stack::intopre()
{
  cout<<"Enter exp";
  int i=0;
  do
  {
   i++;
   cin>>exp[i];
  }while(exp[i][0]!='#');
  puts("\n-------------------------------------------------");
  TOP_e=i-1;
  push();
  while(TOP_e>=0)
  {

    i=check();
    if(i==1)
    push();
    else
    {
      while(!i)
      {
       pop();
       i=check();
      }
      push();
     }
  }
  while(TOP_s>=1)
  {
  TOP_p++;
  strcpy(p[TOP_p],stack[TOP_s]);
  TOP_s--;
  }
  cout<<"\nElement in pol.:\t";
  for(i=TOP_p;i>=1;i--)
  cout<<"  "<<p[i];
}
void stack::show()
{
  cout<<"\nExpression in Prefix Form.:\n\n";
  for(i=TOP_p;i>=1;i--)
  cout<<"  "<<p[i];
}
void main()
{
  clrscr();
  stack x;
  puts("===================================================");
  cout<<"Enter Expression in INFIX FORM.\n";
  cout<<"Enter '#' at the End of Expression.\n";
  puts("===================================================");
  x.intopre();
  puts("\n-------------------------------------------------");
  x.show();
  puts("\n-------------------------------------------------");
  getch();
}