#include<conio.h>     #include<iostream.h>  #include<process.h>    void main() {  int stack[150],top,n,i,max_stack,choice,element,n_pop;  max_stack=150;  cout<<"How many elements are in the stack: ";  cin>>n;  cout<<"Enter "<>stack[top];  cout<<"\nStack is implemented.\nThe stack is\n";  for(i=top-1;i>=0;i--)   cout<>choice;   switch(choice)   {    case 1:     //  PUSH     cout<<"\nPUSH OPERATION\n";     if(top>=max_stack)             {      cout<<"Stack is full!";      getch();      break;     }     cout<<"Enter an element: ";     cin>>element;     stack[top]=element;             top++;     cout<<"Item Inserted!";     getch();     break;    case 2:             // POP     cout<<"POP OPERATION\n";     if(top<0)     {      cout<<"Stack is empty";      getch();      break;     }     cout<<"How many elements you want to pop: ";             cin>>n_pop;     if(n_pop>top)     {      cout<<"\nError!\nStack is small.";      getch();                break;     }     top=top-n_pop;     cout<<"Items POPed";     getch();     break;    case 3:       //  Display     cout<<"\The stack is\n";     for(i=top-1;i>=0;i--)      cout<< stack[i] <<"   ";     getch();     break;    case 4:     exit(0);     getch();    default:     cout<<"RE-enter your choice!";   } // End of switch  }  // End of while  getch(); }