CIS 150 Classes and objects lab

Objectives

Create a class that fulfills a specification
Create objects from classes

Requirements

Modify the supplied program (classLab.cpp) to make it work properly.

Program to be modified

/*
    classLab.cpp
    Name: 
    CIS 150
    Date: 

    Demonstrates simple class/object programming principles.
*/

#include <cctype>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
using namespace std;

/*
    ** TODO **
    Create a class named Product
    It should have three private instance variables
        - a string description
        - an integer for quantity
        - a double for price
    It must have two constructors
        - both constructors must use the mutator methods to set any values
        - a default constructor that sets description to "", quantity and price to 0
        - a constructor that accepts a string, int, and double and uses them to set the instance variables
    Three mutator functions
        - setDescription, with error checking so it uses "Undefined" if attempt to set to zero-length string
        - setQuantity, with error checking so attempt to set negative sets it to 0
        - setPrice, with error checking so attempt to set negative sets it to 0
    Three accessor functions
        - getDescription
        - getQuantity
        - getPrice
    ** END OF TODO **
*/

int getInt(string prompt);
int getInt(string prompt, int min, int max);
double getDouble(string prompt);
string getString(string prompt);
char getChar(string prompt);
char getChar(string prompt, string allowed);
void displayItem(const Product& prod);
int getItemToChange(int length);

int main(int argc, char* argv[]) {
    const int SIZE = 5;
    char choice = '?';
    string menu = "\nd) Description change\nq) Quantity change\np) Price change\nv) View all items\nx) exit\nChoice: ";
    Product items[SIZE];
    int itemNumber = 0;
    
    Product product1("Test item", 42, 52.4);
    cout << "Test product object #1: ";
    displayItem(product1);
    Product product2("", -42, -52.4);
    cout << "Test product object #2: ";
    displayItem(product2);
    
    do {
        choice = toupper(getChar(menu, "dDqQpPvVxX"));
        switch (choice) {
        case 'D':
            itemNumber = getItemToChange(SIZE) - 1;
            cout << "Currently: ";
            displayItem(items[itemNumber]);
            items[itemNumber].setDescription(getString("Enter new description: "));
            cout << "Now: ";
            displayItem(items[itemNumber]);
            break;
        case 'Q':
            itemNumber = getItemToChange(SIZE) - 1;
            cout << "Currently: ";
            displayItem(items[itemNumber]);
            items[itemNumber].setQuantity(getInt("Enter new quantity: "));
            cout << "Now: ";
            displayItem(items[itemNumber]);
            break;
        case 'P':
            itemNumber = getItemToChange(SIZE) - 1;
            cout << "Currently: ";
            displayItem(items[itemNumber]);
            items[itemNumber].setPrice(getDouble("Enter new price: "));
            cout << "Now: ";
            displayItem(items[itemNumber]);
            break;
        case 'V':
            cout << "List of items in inventory:\n";
            for (itemNumber=0; itemNumber<SIZE; itemNumber++) displayItem(items[itemNumber]);
            break;
        case 'X':
            break;
        default:
            cout << "Invalid choice\n";
        }
    } while (choice != 'X');
    return 0;
}

int getInt(string prompt) {
    int val;
    
    cout << prompt;
    while (! (cin >> val)) {
        cin.clear();
        cin.ignore(100, '\n');
        cout << prompt;
    }
    cin.ignore();
    return val;
}

int getInt(string prompt, int min, int max) {
    int val = getInt(prompt);
    while (val < min || val > max) {
        if (val < min) cout << "Error: Value below minimum of " << min << '\n';
        else cout << "Error: Value above maximum of " << max << '\n';
        val = getInt(prompt);
    }
    return val;
}

double getDouble(string prompt) {
    double val;
    
    cout << prompt;
    while (! (cin >> val)) {
        cin.clear();
        cin.ignore(100, '\n');
        cout << prompt;
    }
    cin.ignore();
    return val;
}

string getString(string prompt) {
    string val;
    cout << prompt;
    getline(cin, val);
    return val;
}

char getChar(string prompt) {
    char val;
    
    cout << prompt;
    while (! (cin >> val)) {
        cin.clear();
        cin.ignore(100, '\n');
        cout << prompt;
    }
    cin.ignore();
    return val;
}

char getChar(string prompt, string allowed) {
    char ch = getChar(prompt);
    while (allowed.find(ch) == string::npos) {
        cout << "Error: Invalid choice\n";
        ch = getChar(prompt);
    }
    return ch;
}

void displayItem(const Product& prod) {
    cout << prod.getDescription() << ": " << prod.getQuantity() << " @ "
         << fixed << showpoint << setprecision(2) << prod.getPrice() << '\n';
}

int getItemToChange(int length) {
    stringstream prompt;
    prompt << "Enter item number (1-" << length << "): ";
    int num = getInt(prompt.str(), 1, length);
    return num;
}

Example run of program

Test product object #1: Test item: 42 @ 52.40 Test product object #2: Undefined: 0 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: d Enter item number (1-5): 6 Error: Value above maximum of 5 Enter item number (1-5): 0 Error: Value below minimum of 1 Enter item number (1-5): 4 Currently: Undefined: 0 @ 0.00 Enter new description: 64GB Flash drive Now: 64GB Flash drive: 0 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: q Enter item number (1-5): 4 Currently: 64GB Flash drive: 0 @ 0.00 Enter new quantity: -20 Now: 64GB Flash drive: 0 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: q Enter item number (1-5): 4 Currently: 64GB Flash drive: 0 @ 0.00 Enter new quantity: 13 Now: 64GB Flash drive: 13 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: p Enter item number (1-5): 4 Currently: 64GB Flash drive: 13 @ 0.00 Enter new price: -12.32 Now: 64GB Flash drive: 13 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: p Enter item number (1-5): 4 Currently: 64GB Flash drive: 13 @ 0.00 Enter new price: 9.90 Now: 64GB Flash drive: 13 @ 9.90 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: v List of items in inventory: Undefined: 0 @ 0.00 Undefined: 0 @ 0.00 Undefined: 0 @ 0.00 64GB Flash drive: 13 @ 9.90 Undefined: 0 @ 0.00 d) Description change q) Quantity change p) Price change v) View all items x) exit Choice: x

Rubric

Note: Points may be deducted for not following course style guidelines.
2 points: for the constructors implemented properly
3 points: for the mutators implemented properly
3 points: for the accessors implemented properly
2 points: for the class and instance variables implemented properly