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Interactive C program to Simulate Queue operations on Circular Queue using arrays

shiv@ubuntu:~/ds/queue$ cat  circularq.c
/*
 * Interactive program to simulate Circular Queue using arrays
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define MAX_SIZE 5
#define FALSE 0
#define TRUE 1

/* Insert element into Queue */
int insert(int cq[], int e, int head, int *tail)
{

  if((*tail + 1)%MAX_SIZE == head){
      printf("Queue is full\n");
      return FALSE;
  }

  cq[*tail]=e;
 *tail = (*tail +1)% MAX_SIZE;
  return TRUE;
}

/* Delete element from queue */
int  del(int cq[], int *head, int tail)
{
 if(tail == *head) {
    printf("Queue is empty");
    return FALSE;
 }

 printf("deleted %d\n", cq[*head]);
 *head = (*head + 1)%MAX_SIZE;

 return TRUE;     

}

/* Display elements in the queue */
void display(int cq[], int h, int t)
{
  int i=h;

 printf("Queue elements are ..\n");

 for (i=h; i != t; i=(i+1)%MAX_SIZE)
 {
     printf("%d\n", cq[i]);
 }

}

/* main program to help testing */
int main()
{

int ch, e;
int cq[MAX_SIZE];
int head = 0, tail=0;

while(1){
system("clear");
printf("1 insert\n2 delete\n3 display\n4 exit\n");
printf("Enter choice\n");
scanf("%d", &ch);
 switch(ch) {

    case 1: 
               printf("Enter element to insert\n");
               scanf("%d", &e);
               if(insert(cq, e, head, &tail)){
                  printf("Successfuly inserted \n");
               } else {
                  printf("failure to insert\n");
               }
               break;
    case 2:
              if(del(cq, &head, tail)){
                 printf("Deleted successfully ..\n");
              } else {
                  printf("Can't deleted more \n");
              }
              break;
    case 3: display(cq, head, tail); break;
    case 4: exit(0);
    default: printf("Invalid choice ..\n");
   }
   getchar();
   getchar();
 }

}
/* end of the program*/
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