Question

fully comments for my program, thank you will thumb up

#include <iostream>

#include <fstream>

#include <string>

#include <iomanip>

using namespace std;

struct book

{

int ISBN;

string Author;

string Title;

string publisher;

int Quantity;

double price;

};

void choice1(book books[], int& size, int MAX_SIZE)

{

ifstream inFile;

inFile.open("inventory.txt");

if (inFile.fail())

cout <<"file could not open"<<endl;

string str;

  

while(inFile && size < MAX_SIZE)

{

getline(inFile, str);

books[size].ISBN = atoi(str.c_str());

getline(inFile, books[size].Title);

  

getline(inFile, books[size].Author);

getline(inFile, books[size].publisher);

  

  

  

getline(inFile, str);

books[size].Quantity = atoi(str.c_str());

  

getline(inFile, str);

books[size].price = atoi(str.c_str());

  

getline(inFile, str);

size++;

}

  

cout << "You have successfully read the file." << endl;

inFile.close();

}

void choice2(book books[], int& size, int MAX_SIZE)

{

if(size < MAX_SIZE)

{

string str;

  

cout << "\nEnter the book ISBN: ";

cin >> books[size].ISBN;

  

cout << "Enter the author name: ";

cin >> books[size].Author;

  

cout << "Enter the book tile: ";

cin >> books[size].Title;

cin.get();

  

cout << "Enter the books quantity: ";

cin >> books[size].Quantity;

  

cout << "Enter the book price: $";

cin >> books[size].price;

  

size++;

cout << "You have successfully inserted an entry." << endl;

}

}

void choice3(book books[], int& size)

{

if(size == 0)

cout << "Array is empty. Read the data first." << endl;

else

{

int isbn;

  

cout << "\nEnter the ISBN of the book: ";

cin >> isbn;

  

for(int i = 0; i < size; i++)

{

if(books[i].ISBN == isbn)

{

int j = i;

while(j < size - 1)

{

books[j] = books[j + 1];

j++;

}

  

size--;

break;

}

}

  

cout << "You have successfully deleted an entry." << endl;

}

}

void choice4(book books[], int size)

{

if(size == 0)

cout << "Array is empty. Read the data first." << endl;

else

{

int isbn;

int option;

int qty;

  

cout << "\nEnter the ISBN of the book: ";

cin >> isbn;

  

cout << "1. Increment" << endl;

cout << "2. Decrement" << endl;

cout << "3. Add New" << endl;

cout << "Enter your option: ";

cin >> option;

  

cout << "Enter the quantity: ";

cin >> qty;

  

for(int i = 0; i < size; i++)

{

if(books[i].ISBN == isbn)

{

if(option == 1)

books[i].Quantity += qty;

else if(option == 2)

{

books[i].Quantity -= qty;

  

if(books[i].Quantity)

books[i].Quantity = 0;

}

else if(option == 3)

books[i].Quantity = qty;

  

break;

}

}

  

cout << "You have successfully updated the array." << endl;

}

}

void choice5(book books[], int size)

{

for(int i = 1; i < size; i++)

{

book current = books[i];

int j = i;

while(j > 0 && (books[j - 1].Title).compare(current.Title) > 0)

{

books[j] = books[j - 1];

j--;

}

books[j] = current;

}

  

if(size != 0)

cout << "You have successfully sorted the array." << endl;

else

cout << "Array is empty. Read the data first." << endl;

}

void choice6(book books[], int size)

{

for(int i = 0; i < size; i++)

{

cout << endl;

cout << "Book Number: " << (i + 1) << endl;

cout << "ISBN: " << books[i].ISBN << endl;

cout << "Author: " << books[i].Author << endl;

cout << "Title: " << books[i].Title << endl;

cout << "Quantity: " << books[i].Quantity << endl;

cout << "Price: $" << books[i].price << endl;

}

  

if(size != 0)

cout << "You have successfully printed the array." << endl;

else

cout << "Array is empty. Read the file first." << endl;

}

void choice7(book books[], int size)

{

ofstream outFile;

outFile.open("finalData.dat");

  

for(int i = 0; i < size; i++)

{

outFile << "Book Number: " << (i + 1) << endl;

outFile << "ISBN: " << books[i].ISBN << endl;

outFile << "Author: " << books[i].Author << endl;

outFile << "Title: " << books[i].Title << endl;

outFile << "Quantity: " << books[i].Quantity << endl;

outFile << "Price: $" << books[i].price << endl << endl;

}

  

if(size != 0)

cout << "You have successfully printed the array." << endl;

else

cout << "Array is empty. Read the file first." << endl;

  

outFile.close();

}

// File: Boookstore.cpp

#include<iostream>

#include"yuan.h"

using namespace std;

int main()

{

const int MAX_SIZE=100;

int size = 0;

int choice;

book books[MAX_SIZE];

  

do

{

cout << "1: Read inventory forn file" << endl;

cout << "2: Add an entry" << endl;

cout << "3: Delete an entry" << endl;

cout << "4: Update an entry" << endl;

cout << "5: Sort inventory" << endl;

cout << "6: Display Inventory" << endl;

cout << "7: Write inventory to file and exit" << endl;

cout << "Enter your choice: ";

cin >> choice;

  

switch(choice)

{

case 1:

choice1(books, size, MAX_SIZE);

break;

case 2:

choice2(books, size, MAX_SIZE);

break;

case 3:

choice3(books, size);

break;

case 4:

choice4(books, size);

break;

case 5:

choice5(books, size);

break;

case 6:

choice6(books, size);

break;

  

case 7:

choice7(books, size);

cout << "Thank you." << endl;

break;

default:

cout << "Invalid choice!" << endl;

}

cout << endl;

}while(choice != 7);

  

return 0;

}

fully comments for my program, thank you will thumb up

Answer 1

Comments added.

//header files
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;

//Define a structure book
struct book
{
   //structure variables
   int ISBN;
   string Author;
   string Title;
   string publisher;
   int Quantity;
   double price;
};

//fuction that is called when user selects choice 1 (read inventory from file)
//it accepts an array of structure type book and reference of size and MAX_SIZE as input parameters
void choice1(book books[], int& size, int MAX_SIZE)
{
   //open a file
   ifstream inFile;
   inFile.open("inventory.txt");
  
   //check if file is open or failed
   if (inFile.fail())
       //if file not opened print a error message
       cout <<"file could not open"<<endl;
   string str;
  
   //read the book information from the file opened
   while(inFile && size < MAX_SIZE)
   {
       //each time read a line from file into str
       getline(inFile, str);
      
       //read ISBN into the array, atoi is used to convert string to integer
       books[size].ISBN = atoi(str.c_str());
      
       //read title from file and store in array
       getline(inFile, books[size].Title);
      
       //read Author from file and store in array
       getline(inFile, books[size].Author);
      
       //read publisher from file and store in array
       getline(inFile, books[size].publisher);
      
       //read Quantity from file and store in array, atoi is used to convert string to integer
       getline(inFile, str);
       books[size].Quantity = atoi(str.c_str());
      
       //read price from file and store in array, atoi is used to convert string to double
       getline(inFile, str);
       books[size].price = atoi(str.c_str());
      
       getline(inFile, str);
      
       //increment size, size hold the number of records entered into the structure
       size++;
   }
  
   //print success message
   cout << "You have successfully read the file." << endl;
   //close file
   inFile.close();
}

//function that executes when user selects choice-2(add an entry)
//it accepts an array of structure type book and reference of size and MAX_SIZE as input parameters
void choice2(book books[], int& size, int MAX_SIZE)
{
   //check if the structure reached its max size, if not reached add an item
   if(size < MAX_SIZE)
   {
       string str;
      
       //read ISBN from the user and store it in books array
       cout << "\nEnter the book ISBN: ";
       cin >> books[size].ISBN;
      
       //read Authour name from the user and store it in books array
       cout << "Enter the author name: ";
       cin >> books[size].Author;
         
       //read title from the user and store it in books array
       cout << "Enter the book tile: ";
       cin >> books[size].Title;
       cin.get();
      
       //read Quantity from the user and store it in books array
       cout << "Enter the books quantity: ";
       cin >> books[size].Quantity;
      
       //read price from the user and store it in books array
       cout << "Enter the book price: $";
       cin >> books[size].price;
      
       //increment size of structure array
       size++;
      
       //display success message
       cout << "You have successfully inserted an entry." << endl;
   }
}

//this is the function that executes when user selects choice 3(delete an entry)
//it accepts an array of structure type book and reference of size
void choice3(book books[], int& size)
{
   //check if the structure if empty
   if(size == 0)
       //if empty display error message
       cout << "Array is empty. Read the data first." << endl;
   else
   {
       //else read the ISBN of the book which has to be deleted
       int isbn;
       cout << "\nEnter the ISBN of the book: ";
       cin >> isbn;
      
       //loop through the books array
       for(int i = 0; i < size; i++)
       {
           //for each book encountered check if the cuurent ISBN is equal to ISBN entered by user
           if(books[i].ISBN == isbn)
           {
               //if found, replace current book with next book, so that current book will not be available anymore
               int j = i;
               while(j < size - 1)
               {
                   books[j] = books[j + 1];
                   j++;
               }
              
               //decrement size
               size--;
               //exit loop
               break;
           }
       }
       //display success message
       cout << "You have successfully deleted an entry." << endl;
   }
}
//function that is executed when user selects choice 4(update book details)
void choice4(book books[], int size)
{
   //check if the books is empty
   if(size == 0)
       //if yes display error message
       cout << "Array is empty. Read the data first." << endl;
   else
   {
       //else read the new details and update the book
       int isbn;
       int option;
       int qty;
      
       //read the ISBN of the book which has to be updated
       cout << "\nEnter the ISBN of the book: ";
       cin >> isbn;
      
       //ask the user whether he want to increment or decrement the quatity or change the quantity to new value
       cout << "1. Increment" << endl;
       cout << "2. Decrement" << endl;
       cout << "3. Add New" << endl;
      
       //read user choice
       cout << "Enter your option: ";
       cin >> option;
      
       //read the quantity
       cout << "Enter the quantity: ";
       cin >> qty;
      
       //loop throught the books array
       for(int i = 0; i < size; i++)
       {
           //check if current book encountered is the book we want to update  
           if(books[i].ISBN == isbn)
           {
               //if increment is selected , increment the quantity by the quantity entered
               if(option == 1)
                   books[i].Quantity += qty;
               //if decrement is selected
               else if(option == 2)
               {
                   //decrement the quantity by the quantity entered
                   books[i].Quantity -= qty;
                  
                   //if quantity is 1 set it to 0
                   if(books[i].Quantity)
                   books[i].Quantity = 0;
               }
               else if(option == 3)
               //if option 3 is selected, overwrite the current quantity with new quantity
                   books[i].Quantity = qty;
               //exit loop
               break;
           }
       }
      
       cout << "You have successfully updated the array." << endl;
   }
}
//function that executes when choice 5 is selected (sort inventory)
void choice5(book books[], int size)
{
   //loop through the books array
   for(int i = 1; i < size; i++)
   {
       //declare a new struct variable and assign the current book encountered to the new variable
       book current = books[i];
      
       //declare j and set it to i
       int j = i;
      
       //if j>0 and compare title of previous book with current book
       while(j > 0 && (books[j - 1].Title).compare(current.Title) > 0)
       {
           //if previous book title is greater than current book title, move previous book to current book place
           books[j] = books[j - 1];
           //decremet j
           j--;
       }
       //assign current book to next book
       books[j] = current;
   }
   //if book array size is not 0, display success message else display error message
   if(size != 0)
       cout << "You have successfully sorted the array." << endl;
   else
       cout << "Array is empty. Read the data first." << endl;
}

//function that executes when user selects choice 6(print inventory)
void choice6(book books[], int size)
{
   //loop through the array
   for(int i = 0; i < size; i++)
   {
       //print book details each in a new line
       cout << endl;
       cout << "Book Number: " << (i + 1) << endl;
       cout << "ISBN: " << books[i].ISBN << endl;
       cout << "Author: " << books[i].Author << endl;
       cout << "Title: " << books[i].Title << endl;
       cout << "Quantity: " << books[i].Quantity << endl;
       cout << "Price: $" << books[i].price << endl;
   }
   //if book array size is not 0, display success message else display error message
   if(size != 0)
       cout << "You have successfully printed the array." << endl;
   else
       cout << "Array is empty. Read the file first." << endl;
}
//function that executes when user selects choice 7(write inventory to file)
void choice7(book books[], int size)
{
   //create a new file to which inventory has to be written
   ofstream outFile;
   outFile.open("finalData.dat");
  
   //loop through the array
   for(int i = 0; i < size; i++)
   {
       //write inventory details to file
       outFile << "Book Number: " << (i + 1) << endl;
       outFile << "ISBN: " << books[i].ISBN << endl;
       outFile << "Author: " << books[i].Author << endl;
       outFile << "Title: " << books[i].Title << endl;
       outFile << "Quantity: " << books[i].Quantity << endl;
       outFile << "Price: $" << books[i].price << endl << endl;
   }
  
   //if book array size is not 0, display success message else display error message
   if(size != 0)
       cout << "You have successfully printed the array." << endl;
   else
       cout << "Array is empty. Read the file first." << endl;
  
   //close file
   outFile.close();
}
// File: Boookstore.cpp
#include<iostream>
#include"yuan.h"
using namespace std;
int main()
{
   //declare max size of structure
   const int MAX_SIZE=100;
   //set initial size to 0
   int size = 0;
   //variable to read choice
   int choice;
   //array of structure typr
   book books[MAX_SIZE];
  
   //loop that repeats it executes until the user exits
   do
   {
       //display menu
       cout << "1: Read inventory forn file" << endl;
       cout << "2: Add an entry" << endl;
       cout << "3: Delete an entry" << endl;
       cout << "4: Update an entry" << endl;
       cout << "5: Sort inventory" << endl;
       cout << "6: Display Inventory" << endl;
       cout << "7: Write inventory to file and exit" << endl;
       //read choice from user
       cout << "Enter your choice: ";
       cin >> choice;
      
       //call the appropriate function based on the choice of the user
       switch(choice)
       {
           //if choice 1 is selected, call function choice1, pass books array,size and max size as input parameters
           case 1:
           choice1(books, size, MAX_SIZE);
           break;
           //if choice 2 is selected, call function choice2, pass books array,size and max size as input parameters
           case 2:
           choice2(books, size, MAX_SIZE);
           break;
           //if choice 3 is selected, call function choice3, pass books array and size as input parameters
           case 3:
           choice3(books, size);
           break;
           //if choice 4 is selected, call function choice4, pass books array and size as input parameters
           case 4:
           choice4(books, size);
           break;
           //if choice 5 is selected, call function choice5, pass books array and size as input parameters
           case 5:
           choice5(books, size);
           break;
           //if choice 6 is selected, call function choice6, pass books array and size as input parameters
           case 6:
           choice6(books, size);
           break;
           //if choice 7 is selected, call function choice7, pass books array and size as input parameters
           case 7:
           choice7(books, size);
           cout << "Thank you." << endl;
           break;
           //if invalid choice is entered display error message
           default:
           cout << "Invalid choice!" << endl;
       }
       cout << endl;
   }while(choice != 7); //repeat execution until user wnts to exit
  
   return 0;
}