Fill This Form To Receive Instant Help
Fill This Form To Receive Instant Help
Homework answers / question archive / I need help with this C++ lab
I need help with this C++ lab. Thank you.
Lab 4.2
Using the code from lab 4.1, add the ability to read from a file.
Modify the input function:
* Move the input function out of the Cargo class to just below the end of the Cargo class
* At the bottom of the input function, declare a Cargo object named
temp using the constructor that takes the six parameters.
* Use the Cargo output function to print the Cargo object.
* Call the input function from the main function with no arguments. Remove the rest of the code
from main
Make a file and use it for input. This is good because you will be
using the input many times.
* Make a file named cardata4.txt (or use the one provided),
containing the following three lines of data.
If you make your own, make sure to follow the format
below:
Pallet PAG PAG45982IB 737 4978 OAK
Container AYF AYF23409AA 737 2209 LAS
Container AAA AAA89023DL 737 5932 DFW
* All weights are in pounds, don't worry about kilograms. You may
comment out that code.
* In the input function, declare an object of 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
program.
* 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() == ' ')
inputFile.get();
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 Car.
Hint: with the following while statement:
while(inputFile.peek() != EOF) or use this form while(inputFile >> type)
The peek function will return EOF if there is no next character.
* At the bottom of the input function, close the file.
Put an eye catcher before the beginning of each function, class, and the
global area:
// class name function name comment(if any)
*************************************************
HERE IS THE LAB CODE 4.1
#include <iostream>
#include <string>
#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 parameter 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
else
return false;
}// End of function
public:
// default constructor, does nothing
Cargo(){
}
// 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 accept cargo information from the user
void input()
{
int type, abb;
// Loops till valid unit load entered by the user
do
{
// Displays menu
cout<<"n 1 - Container t 2 - Pallet";
// Accepts unit load
cout<<"n Enter the Unit Load: ";
cin>>type;
// Calls the function to validate input type
if(valid(type, 1, 2))
{
// Checks the type and assigns appropriate constant
if(type == 1)
uld = "Container";
else
uld = "Pallet";
// Come out of the loop
break;
}// End of if condition
// Otherwise invalid data displays error message and continue
else
cout<<"n ERROR: Invalid type Unit Load. Try again.";
}while(true);// End of do - while loop
// Loops till valid container type entered by the user
do
{
// Checks if type is 1 then Container
if(type == 1)
{
// Displays menu
cout<<"n Container type: t 1 - AYF t 2 - AYK t 3 - ABB t 4 - AYY ";
// Accepts abbreviation
cout<<"n Enter the Abbreviation: ";
cin>>abb;
// Calls the function to validate input type
if(valid(abb, 1, 4))
{
// Checks the abb and assigns appropriate constant
if(abb == 1)
abbreviation = "AYF";
else if(abb == 2)
abbreviation = "AYK";
else if(abb == 3)
abbreviation = "ABB";
else if(abb == 4)
abbreviation = "AYY";
// Come out of the loop
break;
}// End of inner if condition
// Otherwise invalid data displays error message and continue
else
cout<<"n ERROR: Invalid type Abbreviation. Try again.";
}// End of if outer condition
// Checks if type is 2 then Pallets
else if(type == 2)
{
// Displays menu
cout<<"n Pallets type: t 1 - PAG t 2 - PMC t 3 - PLA ";
cout<<"n Enter the Abbreviation: ";
cin>>abb;
// Calls the function to validate input type
if(valid(abb, 1, 3))
{
// Checks the abb and assigns appropriate constant
if(abb == 1)
abbreviation = "PAG";
else if(abb == 2)
abbreviation = "PMC";
else if(abb == 3)
abbreviation = "PLA";
// Come out of the loop
break;
}// End of if condition
// Otherwise invalid data displays error message and continue
else
cout<<"n ERROR: Invalid type Abbreviation. Try again.";
}// End of else if condition
}while(true);// End of do - while loop
// Loops till valid unit id entered by the user
do
{
string uid;
// Accepts uid
cout<<"n Enter the Unit ID (5 digit): ";
cin>>uid;
// Checks if length of the uid is 5 then valid
if(uid.length() == 5)
{
// Checks if type is 1 then Container
if(type == 1)
{
// Checks the abb and concatenate constant with uid accordingly
if(abb == 1)
uldid = "AYF" + uid + "IB";
else if(abb == 2)
uldid = "AYK" + uid + "IB";
else if(abb == 3)
uldid = "ABB" + uid + "IB";
else
uldid = "AYY" + uid + "IB";
}// End of inner if condition
// Otherwise type is 2 for Pallets
else
{
// Checks the abb and concatenate constant with uid accordingly
if(abb == 1)
uldid = "PAG" + uid + "IB";
else if(abb == 2)
uldid = "PMC" + uid + "IB";
else
uldid = "PLA" + uid + "IB";
}// End of else
// Come out of the loop
break;
}// End of outer if condition
// Otherwise invalid data displays error message and continue
else
cout<<"n ERROR: Invalid Unit ID. Try again.";
}while(true);// End of do - while loop
cout<<"n Enter Aircraft type: ";
cin>>aircraft;
cout<<"n Enter Weight: ";
cin>>weight;
// declare a variable to store userChoice of weight
int userWeightChoice;
// Prompting the user to select the unit of weight
cout <<"nEnter 1 if weight is in pounds or 2 if weight is in kilograms: " <<endl; // getting user userWeightChoice
cin >> userWeightChoice;
// if the weight choice selected by user is kilogram
if(userWeightChoice == 1){
// call friend function kilotopound
weight = kilotopound(*this);
}
// Loops till valid destination entered by the user
do
{
// Accepts destination
cout<<"n Enter Destination (3 characters): ";
cin>>destination;
// Checks if length of the destination is 3 then valid
if(destination.length() == 3)
// Come out of the loop
break;
// Otherwise invalid data displays error message and continue
else
cout<<"n ERROR: Invalid Destination. Try again.";
}while(true);// End of do - while loop
}// End of function
// Function to display cargo information
void output()
{
cout<<"n ******************";
cout<<"nt Unit Load: "<<uld;
cout<<"nt Abbreviation: "<<abbreviation;
cout<<"nt Unit ID: "<<uldid;
cout<<"nt Aircraft Type: "<<aircraft;
cout<<"nt Weight: "<<weight<<" pounds";
cout<<"nt Destination: "<<destination;
cout<<"n ******************";
}// End of function
// function that overloads == operator that returns true if abbreviation and uldid are same else return false
bool operator==(const Cargo &other) const
{
return((abbreviation == other.abbreviation) && (uldid == other.uldid));
}
};// End of structure
int main()
{
// create unit1 using default constructor
Cargo unit1;
// input the values for unit1 object
cout<<"Enter values for unit1: "<<endl;
unit1.input();
// make a copy of unit1 using a copy constructor
Cargo unit2(unit1);
Cargo unit3; // create an object using default constructor
// check if unit1 and unit2 are equal
if(unit1 == unit2)
cout<<"n unit1 is the same as unit2n";
else
cout<<"n unit1 is not the same as unit2n";
// check if unit2 and unit3 are equal
if(unit2 == unit3)
cout<<"n unit2 is the same as unit3n";
else
cout<<"n unit2 is not the same as unit3n";
/*
// Create object1
cout << "Enter values for object1" << endl;
Cargo object1;
object1.input();
// create ibject 2 using copy constructor
Cargo object2 = object1;
//print both
cout << "Object1" << endl;
object1.output();
cout << endl << "Object2 creating using copy constructor" << endl;
object2.output();
// Creates an array object of class cargo
Cargo cargo[MAX];
// To store number of records
int counter = 0;
// To store user choice
int choice;
// Loops till user choice is not 3
do
{
// Displays menu
cout<<"n ******** MENU **********";
cout<<"nt 1 - Input Cargo Information nt 2 - Display Cargo Information nt 3 - Exit";
// Accepts user choice
cout<<"ntt What is your choice? ";
cin>>choice;
// Checks user choice and calls appropriate function
switch(choice)
{
case 1:
// Checks if current record counter is equals to MAX then display error message
// list full
if(counter == MAX)
cout<<"n ERROR: Full List. Can not add.";
else
{
// Calls the function to accept cargo data
cargo[counter++].input();
}// End of else
break;
case 2:
// Checks if current record counter is equals to 0 then display error message
// empty list
if(counter == 0)
cout<<"n ERROR: Nothing to display. Empty list.";
else
{
for(int c = 0; c < counter; c++)
// Calls the function to display data
cargo[c].output();
}// End of else
break;
case 3:
cout<<"ntt Thanks.";
exit(0);
default:
cout<<"n Invalid choice!!";
}// End of switch - case
}while(true);// End of do - while loop
*/
return 0;
} // End of main function
