C Programming Code Examples
C > Data Structures Code Examples
Program for Circular Queue implementation through Array
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/* Program for Circular Queue implementation through Array */
#include <stdio.h>
#include<ctype.h>
# define maxsize 200
int cq[maxsize];
int front,rear;
void main()
{
void add(int,int [],int,int,int);
int del(int [],int ,int ,int );
int will=1,i,num;
front = 1;
rear = 1;
clrscr();
printf("
Program for Circular Queue demonstration through array
");
while(will ==1)
{
printf("
MAIN MENU:
1.Add element to Circular Queue
2.Delete element from the Circular Queue
");
scanf("%d",&will);
switch(will)
{
case 1:
printf("
Enter the data... ");
scanf("%d",&num);
add(num,cq,maxsize,front,rear);
break;
case 2: i=del(cq,maxsize,front,rear);
printf("
Value returned from delete function is %d ",i);
break;
default: printf("
Invalid Choice . ");
}
printf("
Do you want to do more operations on Circular Queue ( 1 for yes, any other key to exit) ");
scanf("%d" , &will);
} //end of outer while
} //end of main
void add(int item,int q[],int MAX,int front,int rear)
{
rear++;
rear= (rear%MAX);
if(front ==rear)
{
printf("
CIRCULAR QUEUE FULL
");
return;
}
else
{
cq[rear]=item;
printf("
Rear = %d Front = %d ",rear,front);
}
}
int del(int q[],int MAX,int front,int rear)
{
int a;
if(front == rear)
{
printf("
CIRCULAR STACK EMPTY
");
return (0);
}
else
{
front++;
front = front%MAX;
a=cq[front];
return(a);
printf("
Rear = %d Front = %d ",rear,front);
}
}
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