Stack

#include<stdio.h>
int top=0, max=49, item;
int stack[50];
void show()
{
    int i;
    printf("The stack is: ");
    if(top>0)
    {
        for(i=1; i<=top; i++)
        {
            printf("%d ", stack[i]);
        }
    }
    else {
        printf("empty");
    }

    printf("\n\n");
}
void push()
{
    printf("Enter an element:\n");
    scanf("%d", &item);
    if(top==max)
    {
        printf("Overflow\n");

    }
    else
    {
        top++;
        stack[top]=item;
    }
    show();
}
void pop()
{
    if(top==0)
    {
        printf("Underflow\n");
    }
    else
    {
        item=stack[top];
        top--;
        printf("Popped item = %d\n", item);
    }
    show();
}
menu(void)
{
    int choice;
    do
    {
        printf("1-Push\n2-Pop\n3-Exit\n");
        scanf("%d", &choice);
    }
    while(choice <1 || choice >3);
    return (choice);
}
main()
{
    int choice;
    do
    {
        choice=menu();
        switch(choice)
        {
        case 1:
            push();
            break;
        case 2:
            pop();
            break;
        case 3:
            printf("end of operation\n");
            break;
        }
    }
    while(choice!=3);
    return;
}