All Notes on BCA

#include<conio.h>
#include<stdio.h>
#define N 5

int queue[N]={0};
int rear=0,front=0;

void insert(void);
void del(void);
void disp(void);
void cre(void);

void main()
{
    int user=0;
    clrscr();
     do
      {
 clrscr();
 printf("\nTHE SIZE OF QUEUE IS =  %d",N);
 printf("\n\n  1. INSERT  A New Element");
 printf("\n  2. DELETE A First Element");
 printf("\n  3. DISPLAY A Queue List/Element");
 printf("\n  4. CREATE A New Queue Struture");
 printf("\n  5. EXIT\n\nEnter Your Choice : ");
 scanf("%d",&user);
 switch(user)
 {
     case 1:
     clrscr();
  insert();
  break;
     case 2:
     clrscr();
  del();
  getch();
  break;
     case 3:
        clrscr();
  disp();
  getch();
  break;
     case 4:
        clrscr();
  cre();
  getch();
  break;
     case 5:
        clrscr();
  printf("\n\t THANK U");
  getch();
  break;
 }
     } while(user!=5);
}



/*********************Functions********************/
void insert(void)
{
    int t;
    if(rear<N)
    {
 printf("\nENTER A VALUE IN QUEUE : ");
 scanf("%d",&t);
 queue[rear]=t;
 rear++;
    }
    else
    {
    clrscr();
 printf("\nQUEUE OVERFLOW!!!!!!!!!!!!!!!");
 getch();
    }
}
void del(void)
{
    int i;
    printf("\n %d gets deleted.........",queue[front]);
    queue[front]=0;
    front++;//pk
  }

void disp(void)
{
    int i;
    printf("Queue Elements :\n\n");
    for(i=front;i<rear;i++)
    {
 printf("\n\t %d",queue[i]);
    }
}
void cre(void)
{

    int t;
    printf("\nENTER A VALUE IN QUEUE :");
    scanf("%d",&t);
    front=0;
    queue[front]=t;
    rear=front+1;
}

OUTPUT
 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  ENTER A VALUE IN QUEUE : 50

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  ENTER A VALUE IN QUEUE : 100

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  ENTER A VALUE IN QUEUE : 150

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  ENTER A VALUE IN QUEUE : 200

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  ENTER A VALUE IN QUEUE : 250

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 1
  QUEUE OVERFLOW!!!!!!!!!!!!!!!

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 3
  Queue Elements :

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  50 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  50 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  100 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  150 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  200 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  250 gets deleted.........

 1. INSERT  A New Element
 2. DELETE A First Element
 3. DISPLAY A Queue List/Element
 4. CREATE A New Queue Struture
 5. EXIT
  Enter Your Choice : 2
  QUEUE UNDERFLOW