This contain the circular queue operation. [ Inserting an element and deletion of element]

[eshwarprasad]

include<stdio.h>

include<stdlib.h>

int ch,i,item,f=0,r=0,q[5],max=5,c=0;
void insert();
void Delete();
void display();
void main()
{
for(;;)
{
printf("\n\tMENU\n1.INSERT\n2.DELETE\n3.DISPLAY\n4.EXIT\n");
printf("Enter your Choice\n");
scanf("%d", &ch);
switch(ch)
{
case 1: insert();
display();
break;
case 2: Delete();
display();
break;
case 3: display();
break;
case 4: exit(0);

         default: printf("Invalid Input\n");
    }
}

}
void insert()
{
if(f==r && c==max)
{
printf("Insertion not possible, due to overflow\n");
}
else
{
printf("Enter the element to be inserted\n");
scanf("%d", &item);
q[r]=item;
r=(r+1)%max;
c++;
}
}
void Delete()
{
if(f==r && c==0)
{
printf("Deletion is not possible, due to underflow\n");
}
else
{
printf("The item deleted is %d\n",q[f]);
f=(f+1)%max;
c--;
}
}
void display()
{
printf("The circular queue is \n");
for(i=f;i<c+f;i++)
{
printf("%d",q[i]);

 }

}