Stack program in c with pop(), push() and display() functions

Stack program in c with pop(), push() and display() function.

#include<stdio.h>

#include<conio.h>

#include<string.h>

#define max 5

int top=-1;

void push();

int pop();

void display();

int stack_arr[max];

void main()

{

int choice;

clrscr();

while(1)

{

printf("1.Push\n");

printf("2.Pop\n");

printf("3.Display\n");

printf("4.Quit\n");

printf("Enter your choice\n");

scanf("%d",&choice);

switch(choice)

{

case 1:

push();

break;

case 2:

pop();

break;

case 3:

display();

break;

case 4:

return 0;

default:

printf("Wrong choice\n");

}

}

}

void push()

{

int pushed_item;

if(top==(max-1))

{

printf("Stack is overflow\n");

}

else

{

printf("Enter the item to pushed on stack\n");

scanf("%d",&pushed_item);

top=top+1;

stack_arr[top]=pushed_item;

}

}

int pop()

{

int e;

if(top==-1)

printf("Stack underflow\n");

else

{

e=stack_arr[top];

printf("popped element is %d\n",e);

top=top-1;

}

return(e);

}

void display()

{

int i;

if(top==-1)

printf("Stack is empty\n");

else

{

printf("Stack elements\n");

for(i=top;i>=0;i--)

{

printf("%d\n",stack_arr[i]);

}

}

}