Question

C++ Program

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Project 5-1: Monthly Sales

Create a program that reads the sales for 12 months from a file and calculates the total yearly sales as well as the average monthly sales.

Console

Monthly Sales

COMMAND MENU

m - View monthly sales

y - View yearly summary

x - Exit program

Command: m

MONTHLY SALES

Jan        14317.41

Feb         3903.32

Mar         1073.01

Apr         3463.28

May         2429.52

Jun         4324.70

Jul         9762.31

Aug        25578.39

Sep         2437.95

Oct         6735.63

Nov          288.11

Dec         2497.49

Command: y

YEARLY SUMMARY

Yearly total:           76811.12

Monthly average:         6400.93

Command: x

Bye!

Specifications

• Your instructor should provide a tab-delimited file named monthly_sales.txt that contains the month and sales data shown above.
• Round the results of the monthly average to a maximum of 2 decimal digits and make sure that a minimum of 2 decimal digits are displayed on the console.
• Right-align the columns that display the monthly sales, the yearly total, and the monthly average.

Note for Xcode users

• To get this to work correctly on your system, you can set a full path to the file in your code, or you can change the working directory for the Xcode project to the directory that contains the text file.
• To change the working directory for the Xcode project, open the project and select the ProductàSchemeàEdit Scheme item. Then, select the Run category, check the Use Custom Working Directory box, and specify the working directory.

Text file

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Jan   14317.41
Feb   3903.32
Mar   1073.01
Apr   3463.28
May   2429.52
Jun   4324.70
Jul   9762.31
Aug   25578.39
Sep   2437.95
Oct   6735.63
Nov   288.11
Dec   2497.49

Answer 1

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>

using namespace std;

int main() {
    ifstream infile("C:\\monthly_sales.txt");
    double sales[12];
    string months[12];
    int i = 0;
    double sale;
    string month;
    while (infile >> month >> sale)
    {
        sales[i] = sale;
        months[i] = month;
        i++;
    }
    char input;
    cout << "Monthly Sales\n";
    cout << "COMMAND MENU\n";
    cout << "m - View monthly sales\n";
    cout << "y - View yearly summary\n";
    cout << "x - Exit program\n";
    do {
        cout << "Command: ";
        cin >> input;
        switch (input) {
            case 'm':
                cout << "MONTHLY SALES\n";
                for(int i = 0; i < 12; i++){
                    cout << months[i] << "\t" << setw(10) << right << setprecision(2) << fixed << sales[i] << "\n";
                }
                break;
            case 'y':
                double sum = 0;
                for(int i = 0; i < 12; i++){
                    sum += sales[i];
                }
                double average = sum / 12;
                cout << "YEARLY SUMMARY\n";
                cout << "Yearly total:\t" << setw(10) << right << setprecision(2) << fixed << sum << "\n";
                cout << "Monthly average:\t" << setw(10) << right << setprecision(2) << fixed << average << "\n";
                break;
        }
    } while (input != 'x');
    return 0;
}

sample input:

Jan   2.456
Feb   5.56
Mar   66.123
Apr   32.0
May   23.01
Jun   88.003
Jul   99.666
Aug   87.567
Sep   1.123456
Oct   3.00
Nov   2.0003
Dec   55.21

sample output:

Monthly Sales
COMMAND MENU
m - View monthly sales
y - View yearly summary
x - Exit program
Command: y
YEARLY SUMMARY
Yearly total:   465.72
Monthly average:   38.81
Command: m
MONTHLY SALES
Jan   2.46
Feb   5.56
Mar   66.12
Apr   32.00
May   23.01
Jun   88.00
Jul   99.67
Aug   87.57
Sep   1.12
Oct   3.00
Nov   2.00
Dec   55.21
Command: x

Process finished with exit code 0

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