Easiest way to make a queue code by C. It has a bug but working properly

queue.c

#include <stdio.h>
#define max 5
int rear=-1,front=-1,array[max];
void printInstruction()
{
    printf("Press 1 for push\nPress 2 for pop\nPress 3 for display full list\nPress 4 for display top and last\nPress ctrl+z for exit\n\n");
}

void push(int j)
{
    int check = ((max-front+rear)%max)+1;
    if (check == max)
    {
        printf("queue overflow\n\n");
    }
    else
    {
        if (front==-1)
            front=0;
        array[++rear]=j;
    }
}

void pop()
{
    if (front == -1 || front > rear)
    {
        printf("Nothing to pop\n\n");
        return ;
    }
    else
    {
        printf("%d is poped \n\n",array[front++]);
    }
}

void show_list()
{
    int i;
    if (front == - 1)
        printf("Queue is empty \n\n");
    else
    {
        printf("Queue is : ");
        for (i = front; i <= rear; i++)
            printf("%d ", array[i]);
        printf("\n\n");
    }
}
void top_last()
{
    printf("Top value %d\n",array[front]);
    printf("Last value %d\n",array[rear]);
}
int main()
{
    int choise,delement;
    printInstruction();
    while(scanf("%d",&choise)!=EOF)
    {
        if (choise==1)
        {
            int element;
            printf("Enter the number for push : ");
            scanf("%d",&element);
            push(element);
        }
        else if (choise==2)
        {
            pop();
        }

        else if (choise==3)
        {
            show_list();
        }
        else if (choise==4)
        {
            top_last();
        }
        else
        {
            system("clear");
            printf("Wrong entry\n\n");
        }
        printInstruction();

    }
}