Data-Structure/4_Circular_queue_array.c at main · Anjalitripathi0024/Data-Structure · GitHub

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#include <stdio.h>

int cqueue[5], front = -1, rear = -1;


void displayqueue()
{
    int i, j = 1;
    if (front == -1)
    {
        printf("\n  C-Queue is EMPTY !!!");
    }
    else
    {
        if (front <= rear)
        {
            for (i = front; i <= rear; i++)
            {
                printf("\n  Node %d : %d", j, cqueue[i]);
                j++;
            }
        }
        else
        {
            j = 1;
            for (i = front; i <= 4; i++)
            {
                printf("\n  Node %d : %d", j, cqueue[i]);
                j++;
            }
            for (i = 0; i <= rear; i++)
            {
                printf("\n  Node %d : %d", j, cqueue[i]);
                j++;
            }
        }
    }
}


void deletehead()
{
    printf("\n --------------------------------------------");
    if (front == -1)
    {
        printf("\n  C-Queue is EMPTY !!!");
    }
    else
    {
        if (front == rear)
        {
            front = rear = -1;
        }
        else if (front == 4)
        {
            front = 0;
        }
        else
        {
            front++;
        }
        printf("\n  Deleted successfully.");
    }
}

int calcount()
{
    int i, j = 0;
    if (front == -1)
    {
        j = 0;
    }
    else
    {
        if (front <= rear)
        {
            for (i = front; i <= rear; i++)
            {
                j++;
            }
        }
        else
        {
            for (i = front; i <= 4; i++)
            {
                j++;
            }
            for (i = 0; i <= rear; i++)
            {
                j++;
            }
        }
    }
    return j;
}

void insert()
{
    int data;
    if (front == 0 && rear == 4 || front == rear + 1)
    {
        printf("\n  Overflow !!!");
    }
    else
    {
        printf("\n\n Enter Data : ");
        scanf("%d", &data);
        if (front == -1)
        {
            front = rear = 0;
        }
        else if (rear == 4)
        {
            rear = 0;
        }
        else
        {
            rear = rear + 1;
        }
        cqueue[rear] = data;
        printf("\n  Data inserted successfully.");
    }
    printf("\n --------------------------------------------");
}

int main()
{
    int c = 0, d, count = 0;

    do
    {
        count = calcount();
        printf("\n\n\t -: Array Circular Queue Menu :-");
        printf("\n\n 1. Enter Data           ----------");
        printf("\n 2. Display Queue        | Status |");
        printf("\n 3. Delete Head          | (%d/5)  |", count);
        printf("\n 4. Quit                 ----------");
        printf("\n\n Enter choice number : ");
        scanf("%d", &c);
        switch (c)
        {
        case 1:
            insert();
            break;
        case 2:
            displayqueue();
            break;
        case 3:
            deletehead();
            break;
        case 4:
            break;
        default:
            printf("\n  Invalid input !!!");
        }
    } while (c != 4);

    printf("\n\n Press any key to EXIT...");
    return 0;
}