Q1. Give the function header for each of the following functions: 1 2 3 4 Functi

Question

Q1. Give the function header for each of the following functions: 1 2 3 4 Function hypotenuse that takes two double-precision, floating-point arguments, side1 and side2, and returns a double-precision, floating-point result. Function greatest that takes three integers, x, y and z, and returns an integer Function instructions that does not receive any arguments and does not return a value. Function IntToDouble that takes an integer argument, number, and returns a double-precision, floating- point result.

Explanation / Answer

// The array access is 0 indexed
// But we report the user with 1 indexed
#include <stdlib.h>
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
/*
Data:
WHVC 34000.00 5
AAAA 10500.00 8
BURB 23500.00 2
CCCC 15000.00 4
DATA 8000.00 3
EEEE 36000.00 5
FADE 8500.00 4
GATE 25000.00 1
HILO 3000.00 1
JURY 100000.00 5
KNEL 80000 4
LIST 41000.00 3
MEMM 5000.00 2
PQRS 18000.00 2
RELM 27500.00 4
SOLD 22100.00 2
*/

/**
* Structure to store the value of each house
*/
struct house {
    string id;
    double income;
    int members;
}family[100]; // creating families as object of house

void displayMenu();
void readFile(int &size);
void printFamilies(int size);
double getAverageIncome(int size);
void printFamilyMoreThanAverageIncome(int size, double average);
double getHouseHoldsLessThanPovertyLine(int size);
void printDataSortedByIncome(int size);
void printMedianIncome(int size);

int main() {
    int size = 0;
    readFile(size);
    // prompt and load file on startup
    double avg = getAverageIncome(size);
    // store calculated value in variable for re-use and faster response time.
    double percPovertyLine = getHouseHoldsLessThanPovertyLine(size);
    string choice;
    do {
        displayMenu();
        cin >> choice;
        //erase leading spaces(prefixed) from the entered string
        choice.erase(0, choice.find_first_not_of(' '));
        //erase trailing space(suffixed) from the entered string
        choice.erase(choice.find_last_not_of(' ') + 1);
        if ((choice.compare("A")) == 0)
            printFamilies(size);
        else if ((choice.compare("B")) == 0) {
            cout << " Average income of all the families is: $" << avg << endl << endl;
            cout << "Families more than the average income is below." << endl;
            printFamilyMoreThanAverageIncome(size, avg);
        } else if ((choice.compare("C")) == 0)
            cout << "Percentage of families below poverty line is: " << fixed << setprecision(2) << percPovertyLine << "%" << endl;
        else if ((choice.compare("D")) == 0) {
            cout << " Printing the families sorted by income" << endl;
            printDataSortedByIncome(size);
        } else if ((choice.compare("E")) == 0)
            printMedianIncome(size);
        else if ((choice.compare("EXIT")) == 0)
            break;
        else
            cout << "Invalid input!!";
        } while ((choice.compare("EXIT")) != 0);
    return 0;
}

void displayMenu() {
    // cout << "Menu" << endl; //Temp menu
    cout << "Please make a selection from the following menu options:" << endl
        << "(A) Display all input data formatted with columns and column headers." << endl
        << "(B) Display households with income greater than average household income." << endl
        << "(C) Display percentage of households below poverty level." << endl
        << "(D) Display all input data sorted by household income." << endl
        << "(E) Display the median household income." << endl
        << "Type a letter corresponding to your selection or type 'Exit' to quit, then press enter." << endl;
}

/**
* Function to read the file and populate the Structure array
*/
void readFile(int &size) {
    string filename;
    ifstream infile;
    cout << "Enter the filename you want to process: ";
    cin >> filename;
    infile.open(filename.c_str());
    cout << "Searching File ... " << endl;
    if (!infile) { // if file was not found then print the error message and exit, ensure that file is in the workspace
        cout << "The input file '" << filename << "' was not found" << endl;
        exit(0);
    } else {
        cout << "File found!" << endl;
    }
    int i = 0;
    cout << " Reading file ... " << endl;
    while (!infile.eof()) { // read until end of file
        infile >> family[i].id;
        infile >> family[i].income;
        infile >> family[i].members;
        i++;
    }

    size = i;
    infile.close();
    cout << "File read successfully" << endl << endl;
}

/**
* Function to print the structure
*/
void printFamilies(int size) {
    cout << left << setw(15) << "Family ID" << setw(10) << "Income" << setw(10) << "Members" << endl;
    for (int i = 0; i < size; i++) {
        cout << setw(15) << family[i].id << setw(10) << family[i].income << setw(10) << family[i].members << endl;
    }
}

/**
* Family to calculate the average income
*/
double getAverageIncome(int size) {
    double sum = 0;
    for (int i = 0; i < size; i++) {
        sum += family[i].income;
    }
    return (sum / size);
}

/**
* Function to print the households whose income is more than the average income
*/
void printFamilyMoreThanAverageIncome(int size, double average) {
    cout << endl;
    cout << left << setw(15) << "Family ID" << setw(10) << "Income" << setw(10) << "Members" << endl;
    for (int i = 0; i < size; i++) {
        if (family[i].income > average) {
            cout << left << setw(15) << family[i].id << setw(10) << family[i].income << setw(25) << family[i].members << endl;
        }
    }
}

/**
* Function to calculate and return the pecentage of households whose income is less than poverty line
*/
double getHouseHoldsLessThanPovertyLine(int size) {
    int count = 0;
    for (int i = 0; i < size; i++) {
        double P = 8000 + (500 * (family[i].members - 2));
        if (family[i].income < P) {
            count++;
        }
    }
    return (count * 100) / (double)size;
}

/**
* Compare function takes two elements and compares them
* Here the elements will be structs of families
*/

int compareFunc(const void* e1, const void* e2) {
    struct house *family1 = (struct house*) e1;
    struct house *family2 = (struct house*) e2;
    return family1->income-family2->income;
}

/**
* Function to print the families sorted by the income
*/
void printDataSortedByIncome(int size) {
    int i, j;
    // qsort is a predefined method which is used to sort any predefined and
    // userdefined type arrays.
    // it takes 4 arguments
    // 1 : name of the array to be sorted
    // 2 : size of the array to be sorted
    // 3 : size of the each element in the array
    // 4 : a function name in which we put the logic based on which
    //      we compare the array elements
    qsort(family, size, sizeof(struct house), compareFunc);
    printFamilies(size);
}

/**
* Function to print the median income
*/
void printMedianIncome(int size) {
    double medianIncome;
    if (size % 2 != 0){ // if number of families are odd
        int index = (size / 2);
        medianIncome = family[index].income;
    } else { // if number of families are even
        int index1 = size / 2;
        int index2 = index1 + 1;
        medianIncome = (family[index1 - 1].income + family[index2 - 1].income) / 2;
    }
    cout << "Median income is: $" << medianIncome << endl;
}

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