Write a C++ Program for Library database : Linked List

//Library Database

#include
#include
#include

struct library
{
char author[20],title[20],pub[20];
int price;
library *next;
};


int sum=0;

void main()
{
clrscr();
library *head=NULL;
library *initial(void);
library *purchase(library *);
//library *sale(library *);
void display(library *);
void stock(library *);
void search(library *);

int choice;
while(1)
{
cout<<"Choose your Choice\n"; cout<<"1) Initial Data Entry\n"; cout<<"2) Purchase of Book\n"; cout<<"3) Sales of Book\n"; cout<<"4) Stock of Book\n"; cout<<"5) Search of Book\n"; cout<<"6) Display Books\n"; cout<<"7) Exit\n"; cout<<"Enter Your Choice:-"; cin>>choice;
switch(choice)
{
case 1 : head=initial();
getch();
break;
case 2 : head=purchase(head);
getch();
break;
// case 3 : head=sale(head);
// break;
case 4 : stock(head);
getch();
break;
case 5 : search(head);
getch();
break;
case 6 : display(head);
getch();
break;
case 7 : goto out;
default: cout<<"\nInvalid Choice\nTRY AGAIN\n"; } clrscr(); } out: } library *initial(void) { clrscr(); library *newl=NULL,*start=NULL,*end=newl; char ch; while(1) { cout<<"\n\nType y or Y for yes\n"; cout<<"Are you Interested in Entering Entry:-"; cin>>ch;
if(ch=='y' || ch=='Y')
{
newl=new library;
cout<<"\n\nEnter Author of Book:-"; cin>>newl->author;
cout<<"Enter Title of Book:-"; cin>>newl->title;
cout<<"Enter Publication of Book:-"; cin>>newl->pub;
cout<<"Enter Price of Book:-"; cin>>newl->price;
sum=sum+newl->price;
if(start==NULL)
start=newl;
else
end->next=newl;
end=newl;
end->next=NULL;
}
else
break;
}
return(start);
}

library *purchase(library *start)
{
clrscr();
int pos,count=1,choice;
library *newl,*cnt=start,*head=start;
if(start==NULL)
cout<<"\n\nLIST IS EMPTY\n"; cout<<"\n\nChoose your Choice\n"; cout<<"1) Inserting At FIRST POSITION\n"; cout<<"2) Inserting In BETWEEN\n"; cout<<"3) Inserting At LAST POSITION \n"; cout<<"4) Exit\n"; cout<<"Enter your choice:-"; cin>>choice;

if(choice >=1 &&amp; choice <=3) { newl=new library; cout<<"Enter Author Name :-"; cin>>newl->author;
cout<<"Enter Book Title :-"; cin>>newl->title;
cout<<"Enter Publication :-"; cin>>newl->pub;
cout<<"Enter Price of Book:-"; cin>>newl->price;
sum=sum+newl->price;
}

switch(choice)
{
case 1 : //for First position
newl->next=head;
head=newl;
break;

case 2 : //for Middle position
read:
cout<<"\n\nAt which position you want to insert Record:-"; cin>>pos;
while(cnt!=NULL)
{
count++; //cnt for counting variable of type node
cnt=cnt->next;
}
if(pos<1>count+1)
{
cout<<"\n\nEntered position is Invalid\nTRY AGAIN\n"; goto read; } { //Extra Braces are used as case bypasses intialization of a local variable int c=1; while(cnext;
}
}
newl->next=start->next;
start->next=newl;
break;

case 3 : //for Last position
while(start->next!=NULL)
start=start->next;

start->next=newl;
newl->next=NULL;
break;

case 4 : goto out;

default: cout<<"\nEntered Choice is Invalid Try again\n"; break; } out: return(head); } void stock(library *start) { clrscr(); int count=0; while(start!=NULL) { count++; start=start->next;
}
cout<<"\n\n\n\tTotal Number of Books in Stock is "<<<<"\tPurchase Price of Total Stock is "<<<"Enter Book title and its Author name respectively to Search in stock\n"; cin>>title>>author;
while(start!=NULL)
{
if(title==start->title)
{
if(author==start->author)
{
cout<<"\n\nBook is In Stock\n"; cout<<"It Cost Rs"<price;
return;
}
}
}
cout<<"\n\nSEARCH IS NOT IN STOCK\n"; } void display(library *start) { clrscr(); cout<<<"Book Title"<<<"Author of Book"<<<"Publication"<<<"Price"<<<<"=*"; cout<<<title<<author<<pub<<price<next;
}
}