Untitled

#include<stdio.h>
int stack[100],choice,n,top,x,i;
void push(void);
void pop(void);
void display(void);
int main()
{
 //clrscr();
 top=-1;
 printf("\n enterthe size ofSTACK[MAX=100]:");
 scanf("%d",&n);
 printf("\n\t STACK OPERATION USING ARRAY");
 printf("\n\t------------------------");
 printf("\n\t 1.PUSH\n\t 2.POP\n\t 3.DISPLAY\n\t 4.EXIT");
 do
 {
  printf("\n enter the choice:");
  scanf("%d",&choice);
  switch(choice)
  {
    case 1:
    {
     push ();
     break;
    }
    case 2:
    {
    pop();
    break;
    }
    case 3:
    {
     display();
     break;
    }
    case 4:
    {
     printf("\n\t EXIT POINT");
     break;
    }
     default:
    {
      printf("\n\t please enter a valid choice(1/2/3/4)");
    }
  }
 }
  while(choice!=4);
  return 0;
}
void push()
{
 if(top>=n-1)
 {
  printf("\n\t STACK is over flow");
 }
 else
 {
  printf("enter a valuie to be pushed:");
  scanf("%d",&x);
  top++;
  stack[top]=x;
 }
}
void pop()
{
 if(top<=-1)
 {
  printf("\n\t stack is under flow ");
 }
 else
 {
  printf("\n\t the popped elements is %d",stack[top]);
  top--;
 }
}
void display()
{
 if(top>=0)
 {
  printf("\n the elements in STACK\n");
  for(i=top;i>=0;i--)
  printf("\n%d ",stack[i]);
  printf("|n press next chioce");
 }
 else
 {
  printf("\n the STACK is empty");
 }
}