IMPLEMENTATION OF STACK USING ARRAYS(PASSING PARAMETERS)

#include<stdio.h>
void push(int *,int *,int []);
int pop(int *,int []);
void display(int *,int []);
int size;
main()
{
      int top=-1;
      int item,s[50];
      int choice;
      int flag;
      printf("\n..ENTER THE SIZE OF THE STACK..\n");
      scanf("%d",&size);
    do
    {
         printf("\nMENU\n1.PUSH\n2.POP\n3.EXIT\nEnter your choice : ");
         scanf("%d",&choice);
         switch(choice)
         {
              case 1:
                     printf("\nENTER THE ELEMENT YOU WANT TO PUSH\n");
                     scanf("%d",&item);
                     push(&item,&top,s);
                     display(&top,s);
                     break;
              case 2:
                    flag=pop(&top,s);
                    
                    if(flag==-1)
                    {
                         printf("\n...THE STACK IS EMPTY...\n");
                    }
                    else
                     printf("\n...THE POPPED OUT ELEMENT..%d",flag);
                    printf("\n");
                    display(&top,s);
                    break;
             case 3:
                    printf("\n...YOU HAVE EXITED..\n");
                    break;
         }  
    }while(choice!=3);
}
void push(int *item,int *top,int s[50])
{
   if(*top==size-1)
   {
       printf("\n THE STACK IS FULL \n");
       return;
   }
   s[++(*top)]=*item;
}
int pop(int *top,int s[50])
{
   if(*top==-1)
   {
       return -1;
   }
   return s[(*top)--];
}
void display(int *top,int s[50])
{
   int i;
   for(i=*top;i>=0;i--)
   {
       if(i==*top)
       {
           printf("TOP->%d\n",s[i]);
       }
       else
       printf("     %d\n",s[i]);
   }
}