Queue program #2

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22. Implement Circular Queue using array that performs following operations: INSERT, DELETE,DISPLAY.

#include<stdio.h>
#define N 5
int q[N];
int f=-1;
int r=-1;

void cqinsert(int y);
int cqdelete();
void display();

void main()
{
     int ch,x,a;

    printf ("QUEUE OPERATION\n");
    while (1)
    {
        printf ("------------------------------------------\n");
        printf ("      1    -->    INSERT               \n");
        printf ("      2    -->    DELETE               \n");
        printf ("      3    -->    DISPLAY               \n");
        printf ("      4    -->    EXIT           \n");
        printf ("------------------------------------------\n");
        printf ("Enter your choice\n");
        scanf    ("%d", &ch);
        switch (ch)
        {
        case 1:
            printf ("Enter the element to be insert in queue:\n");
            scanf ("%d", &x);
            cqinsert(x);
           
            break;
        case 2:
            a=cqdelete();
            if(a!=0)
            printf("Delete=%d\n",a);
           
            break;
        case 3:
            display();
            break;
        case 4:
            return;
        default :
            printf("Invalid entered choice, please enter choice between 1 to 4.\n");
            }
     }
}

void cqinsert(int y)
{
   
     if(f>r && r==f-1 || f==0 && r==N-1)
     {
          printf("Queue Overflow\n");
          return;
     }
     if(f<r && r==N-1)
     {
          r=0;
     }
     else
     {
          r=r+1;
     }
     q[r]=y;
     if(f==-1)
     {
          f=0;
          return;
     }
}

int cqdelete()
{
     int y;
     if(f==-1)
     {
          printf("Queue Underflow\n");
          return(0);
     }
     y=q[f];
     if(f==r)
     {
          f=r=-1;
          return(y);
     }
     if(f==N-1)
     {
           f=0;
     }  
     else
     {
           f=f+1; 
      }     
      return(y);
}

void display()
{
     int j;
     if(f==-1 && r==-1)
     {
          printf ("Queue is empty\n");
     }
     if (f<=r)
     {
       printf ("\nThe status of the queue is \n");
        for (j=f;j<=r;j++)
        {
            printf ("%d\t", q[j]);
        }
        printf("\n");
     }
     else
     {
        printf ("\nThe status of the queue is \n");
        for (j=f;j<=N-1;j++)
        {
         printf ("%d\t", q[j]);
        }
        for (j=0;j<=r;j++)
        {
           printf ("%d\t", q[j]);
        }
        printf("\n");
     }
}

Output

  1. QUEUE OPERATION
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    1
    Enter the element to be insert in queue:
    12
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    1
    Enter the element to be insert in queue:
    13
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    1
    Enter the element to be insert in queue:
    14
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    1
    Enter the element to be insert in queue:
    15
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    3

    The status of the queue is
    12    13    14    15   
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    2
    Delete=12
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    2
    Delete=13
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    1
    Enter the element to be insert in queue:
    16
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    3

    The status of the queue is
    14    15    16   
    ------------------------------------------
          1    -->    INSERT              
          2    -->    DELETE              
          3    -->    DISPLAY              
          4    -->    EXIT          
    ------------------------------------------
    Enter your choice
    4







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