Stack menu driven program.

 Write a C program of Stack menu driven using if-else statements and switch case. 

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#define max 5

int top=-1,s[max];
void push(int n)
{  
  if(top==max-1)
    {  
       puts("Stack is overflown");
      return;
   }
    else
    {  top=top+1;
      s[top]=n;
    }   }
void pop()
{
   int del;
   if(top==-1)
   { 
      puts("Stack is underflown");
      return;   }
      else
      {   
          del=s[top];
	 printf("\n poped element is %d",del);
	 top=top-1;
      }   }
void display()
{   
     int i;
    if(top==-1)
    puts("stack is empty");
    else
    {   for(i=top;i>=0;i--)
	  printf("\t %d",s[i]);
    }   }
int main()
{  int opt,n;
   do
   {
       printf("\n 1. push");
       printf("\n 2. pop");
       printf("\n 3. display");
       printf("\n 4. exit");
       printf("\n enter your choice :: ");
       scanf("%d",&opt);
       switch(opt)
       {
       case 1:
	    printf("\n enter any element to push :: ");
	    scanf("%d",&n);
	    push(n);
	    break;
       case 2:
	    pop();
	    break;
       case 3:
	    display();
	    break;
       case 4:
	    exit(0);
	    break;
       }   }
   while(1);
   return 0;
}