Infix 2 Postfix

#include <iostream>
#include <conio>
void pop(char,int*,char*);
void print(char*);
char push(int*,char*);
char in[50],out[50],stack[50],ch;
int main()
{
  int top=-1,i,j=0;
    clrscr();
    cout<<"\n\nPlease enter your prasse:";
    cin>>in;
    for(i=0;i<50;i++)
    {
        if((in[i]>96&&in[i]<123)||(in[i]>64&&in[i]<91))
        {
          out[j]=in[i];
          ++j;
        }
        else if(in[i]!=')')
          pop(in[i],&top,stack);
        else if(in[i]==')')
        {
          while(top>-1)
          {
            ch=push(&top,stack);
            if(ch!='(')
            {
               out[j]=ch;
               ++j;
            }
          }
        }
    }
  print(out);
  print(stack);
  getch();
  return 0;
}
//*************************************
void pop(char x,int* up,char *stack)
{
  *up+=1;
  if(*up>49)
    cout<<"Sorry Stack Is Full";
  else
    stack[*up]=x;
}
//*************************************
char push(int *up,char *stack)
{
  if(*up<0)
    cout<<"\nSorry Stack Is Empety\n\n";
  else
    *up-=1;
return stack[*up+1];
}
//*************************************
void print(char*s)
{
  for(int i=0;i<50;i++)
    if(s[i])
      cout<<s[i];
}