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Homework answers / question archive / Topics: Inheritance Virtualization Files ----------------------------------------------------------------------------------------------------------------------------------------- Refer to the file airfreight

Topics: Inheritance Virtualization Files ----------------------------------------------------------------------------------------------------------------------------------------- Refer to the file airfreight

Computer Science






Refer to the file airfreight.doc or airfreight.docx for sample class information before you re-write your class.


Pallet PAG PAG45982IB 737 4978 OAK

Container AYF AYF23409AA 737 2209 LAS

Container AAA AAA89023DL 737 5932 DFW

Lab 5.1

Utilizing the code from Lab 4.2, replace your Cargo class with a new base class. This will be the base for two

classes created through inheritance. The Cargo class will need to have virtual functions in order to have them

redefined in the child classes. You will be able to use many parts of the new Cargo class in the child classes

since they will have the same arguments/parameters and the same functionality.

Child class one will have the information for our 737 aircraft, with the addition of maxload, which is 46000 pounds.

Child class two will have the information for our new 767 aircraft, which has the following information:

Unit and type: Container or Pallet: AKE, APE, AKC, AQP, AQF, AAP Containers and P1P, P6P Pallets

Unit ID: Container or Pallet type: five digits + airline code; our ID code is IB, e.g. AYF12345IB

Aircraft type: Ours is a 767

Weight: The weight, in pounds, of the loaded container or pallet

Destination: A three alpha character IATA string, e.g. MFR (Medford, OR), or BUR (Burbank, CA)

Maxload: 767-300 max load is 116000 pounds

The 737-200 is a single hold, narrow body aircraft, designed to hold up to approximately 23 tons of cargo.

The 767-300 is a dual hold (upper and lower) designed to handle approximately 58 tons of cargo. IBA does not

carry refrigerator (reefer) containers or animal containers due to handling limitations.

Change private to protected in the Cargo class only.

Make two classes which inherit from the Cargo class: Boeing737 and Boeing767.

Each class will need to inherit a default constructor, a copy constructor, and a constructor that has six parameters. Only one more function will be built in each class; all the rest will be inherited.

The unit and type data are different for each class as is the aircraft type. Maxload is provided for both aircraft. Our

737 can hold up to 46000 pounds, and our 767 can hold up to 116000 pounds.

Create two new global functions named load737 and load767. These are used to build a unit for Boeing737 or a Boeing767, respectively.

Revise the main function to call the input function and do nothing else.

The data file lab5data.txt is provided for your use. Your program will be tested with different data, but the format

Is guaranteed to be correctly formatted, and not to exceed 20 lines.

In the input function loop reads one line from the file each time through the loop, look at the aircraft field in the record and call the corresponding build function to build that type of unit. Before calling the appropriate build function, print a header giving the sequence number of the unit read, with the number 1 for the first unit and incremented for each successive unit. For both child classes, ensure that the units are compatible with the aircraft. For example, the 737 cannot hold an AQF type container. Ensure that the weight totals for both types of aircraft are not exceeded by the units assigned to them. If they are at or near capacity, check to ensure that another unit would not put them over the weight limit, if it would, then reject the unit and move on to the next unit in the file.

Store each unit object in an array of objects of the appropriate type, either for the 737 or the 767.

Once input has completed, you will have a number of objects of two different types stored in two different arrays.

Use output to send the contents of each array's objects to the screen, taking care to output all of the 737 units

together and all of the 767 units together as well as the weight totals for both aircraft.

* Use the lab5data.txt file which will contain data similar to

  the following three lines of data; lab5data.txt will have no

  more than 20 lines of data

Pallet         PAG   PAG45982IB  737   4978  OAK

Container AYF    AYF23409AA 767   2209  LAS

Container AAA   AAA89023DL 767  5932  DFW

     * All weights are in pounds, don't worry about kilograms.

     * In the input function, declare an object of type ifstream named

       inputFile, which we will use to read from the file.

     * At the beginning of the code for the input function, open the

       file. If the open fails, send a message to stderr and exit the


     * In all the reads within the input function, remove the user

       prompt and read from the inputFile object, rather than reading

       from the stdin object.

     * Hint: We need to use getline when reading the strings.

       using >> skips leading white space before reading the data.

       getline does not skip this leading whitespace. So, before using

       getline use the following code:

               while(inputFile.peek() == ' ')


        peek looks at the next character you are about to read. If it is

       a space, get is used to read the space character, to get it out

       of the way. Your output will then be much neater.

     * Use a loop to read each line from the file. Use a

       while loop including all the reading in the input function, as

       well building and output of the Cargo.

  Hint: you can do with the following while statement:

               while(inputFile.peek() != EOF) or

             while(!inputFile.eof) or

              while (inputFile >> type)


       The peek function will return EOF is there is no next character.

       The .eof will turn true when eof is reached

       The read of type with >> if true when there is data present, else it is false

     * At the bottom of the input function, close the file.

        This is good code for opening a file and testing to see if it opened successfully.

ifstream inputFile;"lab5data.txt");

   // If the open fails, send a message and exit



       std::cerr << "Error opening the file" << endl;



   while (inputFile.peek()!= EOF)




#include <iostream>

#include <fstream>

#include <sstream>

#include <cstdlib>

#define MAX 100

using namespace std;

// Defines a class to store cargo information

class Cargo


string uld;

string abbreviation;

string uldid;

int aircraft;

int weight;

string destination;

// Function to return true if the parameter no is within second parameter min and third parmeter max

// otherwise returns false

bool valid(int no, int min, int max){

// Checks if no is greater than or equals to min and less than or equals to max return true

if(no >= min && no <= max)

return true;

// Otherwise returns false


return false;

}// End of function


// default constructor, does nothing



// Paramterised constructor with six arguements

Cargo(string Uld,string abb,string Uldid,int craft,int Weight, string dest){

uld = Uld;

abbreviation = abb;

uldid = Uldid;

aircraft = craft;

weight = Weight;

destination = dest;


// Copy constructor

Cargo(const Cargo &c2) {

uld = c2.uld;

abbreviation = c2.abbreviation;

uldid = c2.uldid;

aircraft = c2.aircraft;

weight = c2.weight;

destination = c2.destination;


// friend function, kilotopound, which will convert kilograms to pounds

friend int kilotopound(Cargo c){

// return pounds

return (c.weight * 2.2);



// Function to display cargo information

void output(){

cout<<"\n *******************************************";

cout<<"\n\t Unit Load: "<<uld;

cout<<"\n\t Abbreviation: "<<abbreviation;

cout<<"\n\t Unit ID: "<<uldid;

cout<<"\n\t Aircraft Type: "<<aircraft;

cout<<"\n\t Weight: "<<weight;

cout<<"\n\t Destination: "<<destination;

cout<<"\n *******************************************";

}// End of function

};// End of structure

// Function to accept cargo information from the user

void input(){

// Create file and use it for input

ifstream inputFile;

// Required variables

string line,uld,abb,uldid,dest;

int craft,weight;

// Open file cardata4.txt"cardata4.txt");

//Check if opening the file fails


cerr << "File cannot be opened." << endl;



//Loops till the file pointer inputFile reaches end of the file

while(inputFile.peek() != EOF){

//Reads each line of the file


//Creates a stream object for the line

stringstream linestream(line);

//Reads line values to the respected variables

linestream >> uld >> abb >> uldid >> craft >> weight >> dest;

//Calls the constructor with six arguements using object temp

Cargo temp(uld,abb,uldid,craft,weight,dest);

//Calls output function of cargo object




}// End of function

// main function definition

int main()


cout << "Cargo details from input file ";

//Call input function


return 0;

}// End of main function

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