Lab 5: Arrays and Strings

Objectives

In this lab assignment, students will learn:

How to declare one-dimensional and two-dimensional Arrays

How to save data in one-dimensional and two-dimensional Arrays

How to use a for loop to iterate one-dimensional and two-dimensional Arrays

How to access and retrieve data from one-dimensional and two-dimensional Arrays

How to pass one-dimensional and two-dimensional Arrays to a function

How to use parallel arrays

How to declare and use the c-string

COURSE PREPARATION

Read the following documents:

Create Project Programs: In Course Resources

CSC134-Coding Guidelines: In Course Resources

Textbook:

Read Chapters 8 in Maliks C++ Programming 8^th edition textbook.

Chapter 8 Exercise: (100 pts)

Introduction to Arrays

Goals:

In this lab assignment, students will demonstrate the ability to:

Learn how to create an array and use c-string.

-Declare one-dimensional and two-dimensional Arrays

-Save data in one-dimensional and two-dimensional Arrays

-Use a for loop to iterate one-dimensional and two-dimensional Arrays

-Access and retrieve data from one-dimensional or two-dimensional Arrays

-Pass one-dimensional and two-dimensional Arrays to a function

-Use parallel arrays

-Declare and use the c-string

Grading:

Be sure to follow the Coding Standard Guidelines. You must properly indent and comment your code. This program is worth 100 points.

Grading rubric:

Indent code and insert comments to document your program. [10 pts]

Program must be implemented and run as instructed. [80 pts]

The folder containing the program project should be zipped up into a file called (Lab5_yourName.zip or Lab5_yourName.zipx or Lab5_yourName.rar). The zipped file is submitted to Blackboard. Please use these file names exactly. [10 pts]

Instructions:

Please read this lab exercise thoroughly, before attempting to code it. It would be a good idea to use pencil and paper to organize your thoughts on how best to solve this exercise.

Program Description:

The United Nations provided 2009 Marital Status of Men and Women in the US (http://data.un.org/DocumentData.aspx?id=322).

Write a program to analyze the marital status of the combined total of men and women in the US. The categories being analyzed is as follows:

Single Men

Married Men

Widowed Men

Divorced Men

Separated Men

Single Women

Married Women

Widowed Women

Divorced Women

Separated Women

The program first reads headings, categories and the statistics from the file and saves them into three arrays:

Create a one-dimensional string array of the tableHeadings.

Create a one-dimensional string array Categories to store the different categories.

Create a (parallel) two-dimensional double array CatPerc to store percentage in each category. This array has 11 columns of the percentages in each age group.

The program then retrieves the percentages from the array CalcPerc, calculates average percentage of the combined men and women in each category. (Ignore age range 60-64 in calculation)

i.e. (Single Men Average + Single Women Average)/2.0

where Single Men Average = (Sum of Single Men Percentages) / 10.0 and Single Women Average = (Sum of Single Women Average)/10.0 .

Use the table below to assign the representation code to each combined men and women average in each combined category.

Average	Representation Code
>= 40	H - High
>= 25	N - Normal
< 25	L -Low

The program must contain at least the following functions:

(1) A function read_data to read and store data into tableHeadings, categories and calcPerc arrays.

(2) A function analyze_stats to calculate the combined men and women averages, determine the Representation Code, get the number of High, Normal and Low Representation Codes, find the highest and lowest average of all combined categories.

(3) A function display_results to display the results.

Sample Output:

Use the following driver to test your functions:

#include

#include

#include

#include

using namespace std;

const int NUM_HEADINGS = 13;

const int NUM_CATEGORIES = 10;

const int NUM_COMBINED_PERC = 5;

const int NUM_PERCENTAGE = 11;

void read_data(ifstream &input, string tableHeadings[], string categories[],

double catPerc[][NUM_PERCENTAGE]);

void analyze_stats(double catPerc[][NUM_PERCENTAGE], double combinedPerc[],

int &high_cnt, int &norm_cnt, int &low_cnt,

double &highest,double &lowest);

void display_results(string categories[],double combinedPerc[], int high_cnt, int norm_cnt,

int low_cnt, double highest, double lowest);

int main()

{

string tableHeadings[NUM_HEADINGS];

string categories[NUM_CATEGORIES];

double catPerc[NUM_CATEGORIES][NUM_PERCENTAGE];

double combinedPerc[NUM_COMBINED_PERC];

double highest = 0.0, lowest = 0.0;

char representativeCode[NUM_COMBINED_PERC];

int high_cnt = 0, norm_cnt = 0, low_cnt = 0;

ifstream inFile;

inFile.open("lab5-MaritalStatus2009Survey.txt", ios::in);

if (!inFile.is_open())

{

cout << "Error: Cannot open file...Exiting." << endl;

system("pause");

exit(0);

}

//Read the input file and populate the arrays.

read_data(inFile, tableHeadings, categories,catPerc);

//Use the populated category percentage array to derive the combined percentage,

//count of high, norm and low representation codes.

analyze_stats(catPerc,combinedPerc,high_cnt,norm_cnt,low_cnt,highest,lowest);

//Display the results

display_results(categories,combinedPerc, high_cnt,norm_cnt,low_cnt,highest,lowest);

inFile.close();

system("pause");

return 0;