Stack using Arrays using C

-
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
void push(int a[],int*tp)
{
    int data,choice=1;
    while(choice==1)
    {
    printf("enter the element to be inserted");
    scanf("%d",&data);
    *tp = *tp+1;
    a[*tp]=data;
    printf("want another data to be pushed (0,1): ");
    scanf("%d",&choice);
    }
}
void pop(int a[],int*tp)
{
    int data,choice=1;
    while(choice==1)
    {
    data=a[*tp];
    *tp=*tp-1;
    printf("deleted %d from stack\n",data);
    printf("want another data to be popped (0,1): ");
    scanf("%d",&choice);
    }
}
void display(int a[],int*tp)
{
    int i;
    for(i=*tp;i>=0;i--)
        printf("%d\n",a[i]);
}
int main()
{
    int arr[100],top=-1,i,choice=1,ch;
    while(choice==1)
    {
        printf("enter 1. to Push element in stack\n");
        printf("enter 2. to pop element in stack\n");
        printf("enter 3. to display elements of stack\n");
        scanf("%d",&ch);
        if(ch==1)
        {
            if(top==99)
            printf("Stack overflow");
            else
            push(arr,&top);
        }
        else if(ch==2)
        {
            if(top==-1)
                printf("stack underflow");
            else
                pop(arr,&top);
        }
        else if(ch==3)
        {
            display(arr,&top);
        }
        else
            printf("Invalid Choice");

        printf("Do you want to continue (0,1): ");
        scanf("%d",&choice);
    }
}

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