#include<stdio.h>
#include<stdlib.h>
#define MAX 5
int push(int[],int);
int pop(int[],int);
void display(int[],int);
int main()
{
  system("clear");
  int stack[MAX],top,item,ch;
  top=-1;
  while(1)
  {
	 printf("\n0: Quit");
	 printf("\n1: Push");
	 printf("\n2: Pop");
	 printf("\n3: Display");
	 printf("\nEnter choice:");
	 scanf("%d",&ch);
	 switch(ch)
	 {
		case 0: return 0;
		case 1: top=push(stack,top);
				  break;
		case 2: top=pop(stack,top);
				  break;
		case 3: display(stack,top);
				  break;
		default:printf("\nInvalid choice");
	 }
  }
}
int push(int stack[],int top)
{
  int item;
  if(top==MAX-1)
  {
	 printf("\nOverflow");
	 return 0;
  }
  printf("\nEnter item: ");
  scanf("%d",&item);

  top++;
  stack[top]=item;

  return top;
}
int pop(int stack[],int top)
{
  int item;
  if(top==-1)
  {
	 printf("\nUnderflow");
	 return 0;
  }
  item=stack[top];

  top--;
  printf("\nItem poped= %d",item);
  return top;
}

void display(int stack[],int top)
{
  int i;
  printf("\nStack elements are: ");
  for(i=0;i<=top;i++)
	 printf("%d ",stack[i]);
}