Implementation of stack Using Array

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Implementation  of stack Using Array

#include<stdio.h>
void pop();
void push();
void display();
int i,n,ch=0,top,item,stack[50];
int main()
{

    printf("Enter the number of element in Stack:\t");
    scanf("%d",&n);
    top=-1;
    printf("Stack Operations");
    printf("\n1.Push\n2.Pop\n3.Display\n4.Exit\n");
   do
    {
        printf("Enter the choice: ");
        scanf("%d",&ch);
        switch(ch)
        {
            case 1:push();
                   break;
            case 2:pop();
                   break;
            case 3:display();
                   break;
            case 4:exit(0);
                   break;
            default:printf("!!Wrong choice!!\n");
        }
    }
    while(ch!=4);
    return 0;
}
void push(int item)
{
    if(top==n-1)
        printf("Overflow\n");
    else
    {
        printf("Enter a value to be pushed:\n");
        scanf("%d",&item);
        stack[++top]=item;
    }
}
void pop()
{
    int tmp;
    if(top==-1)
    {
        printf("underflow\n");
    }
    else
    {
        printf("Pop elements is %d\n",stack[top]);
        top--;
    }
}
void display()
{
    if(top>0)
    {
        printf("Element in Stack is: \n");
        for(i=0;i<n;i++)
        {
            printf("%d ",stack[i]);
        }
        printf("\nEnter next choice");
    }
    else
        printf("stack is empty.\n");

}

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