C Program For Queue Using Array

/*Queue using array*/
#include<stdio.h>
#include<conio.h>
#define MAX_SIZE 10
int top=-1;
int bot=0;

void enque(int[]);
void deque(int[]);
void display(int[]);
void isempty(void);
void isfull(void);

void main(void)
  {
int a[MAX_SIZE],ch;
clrscr();
do
{
printf("\n1.Enque\n");
printf("2.Dque\n");
printf("3.Display\n");
printf("4.Isempty\n");
printf("5.Isfull\n");
printf("6.Exit\n");
printf("Enter the choice");
scanf("%d",&ch);
 switch(ch)
 {
 case 1:enque(a);
  break;
 case 2:deque(a);
  break;
 case 3:display(a);
  break;
 case 4:isempty();
  break;
 case 5:isfull();
  break;
 }
}while(ch!=6);
}


void enque(int x[MAX_SIZE])
{
 if (top<MAX_SIZE-1)
 {
 top++;
 printf("Enter the element\n");
 scanf("%d",&x[top]);
 }
 else
 {
 isfull();
 }
}

void deque(int x[MAX_SIZE])
{
 if (top>=bot)
 {
 printf("The element to be deleted is %d\n",x[bot]);
 bot++;
 }
 else
 {
 isempty();
 }
}




void display(int x[MAX_SIZE])
{
int i;
 for(i=bot;i<=top;i++)
 {
 printf("%d ",x[i]);
 }

}


void isempty(void)
{
 if(top<bot)
 {
 printf("Q is empty\n");
 }
 else
 {
 printf("Q is not empty\n");
 }
}


void isfull(void)
{
 if (top==MAX_SIZE-1)
 {
 printf("Q is full\n");
 }
 else
 {
 printf("Q is not full\n");
 }
}