Question

can someone please comment through this code to explain me specifically how the variables and arrays are working? I am just learning arrays

code is below assignment

C++ Programming from Problem Analysis to Program Design by D. S. Malik, 8^th ed.

Programming Exercise 12 on page 607

Lab9_data.txt

Jason, Samantha, Ravi, Sheila, and Ankit are preparing for an upcoming marathon. Each day of the week, they run a certain number of miles and write them into a notebook. At the end of the week, they would like to know the number of miles run each day, the total miles for the week for each runner, and average miles run each day BY THE WHOLE GROUP. Write a program to help them analyze their data. Your program must contain parallel arrays: an array to store the names of the runners and a two-dimensional array of five rows and seven columns to store the number of miles run by each runner each day. Furthermore, your program must contain at least the following functions: a function to read and store the runners’ names and the numbers of miles run each day; a function to find the total miles run by each runner and the average number of miles run each day; and a function to output the results. (Your may assume that the input data is stored in a file and each line of data is in the following form: runnerName milesDay1 milesDay2 milesDay3 milesDay4 milesDay5 milesDay6 milesDay7.)

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

using namespace std;

// constant variable declaration
const int COUNT = 5;
const int DAYS = 7;

// This functions tores the names of runners and number of mils run each day
void inputData(string names[], int sizeOfName, double numOfMiles[][DAYS], int rowSize)

{
   //Create input file name
   ifstream infile;
   infile.open("Lab9_data.txt ");
   int checkNames = 0, checkMiles = 0;

   while (checkNames < sizeOfName)
   {
       infile >> names[checkNames];
       while (checkMiles < DAYS)
       {
           infile >> numOfMiles[checkNames][checkMiles];
           checkMiles++;
       }
       checkMiles = 0;
       checkNames++;

   }
}

/* This function is to find the total miles run by each runner and the
avg number of miles run each day*/

void computeMiles(double status[][2], double numOfMiles[][DAYS], int rowSize)
{
   // declare variables
   double total = 0, avg = 0;
   int runCount = 0, num = 0;

   cout << fixed << showpoint << setprecision(2) << endl;
   while (runCount < rowSize)
   {
       while (num < DAYS)
       {
           total = total + numOfMiles[runCount][num];
           num++;
       }
       avg = (total / DAYS);
       status[runCount][0] = total;
       status[runCount][1] = avg;
       total = 0;
       avg = 0;
       num = 0;
       runCount++;
   }
}

// function displays runner's names, total miles and avg of runners
void displayResult(double status[][2], string names[], int sizeOfName)
{
   cout << setw(10) << "Runner Name" << setw(12)
       << "Total miles" << setw(10) << "Average" << endl;
   int runCount = 0;
   while (runCount < sizeOfName)
   {
       cout << setw(10) << names[runCount] << setw(12) << status[runCount][0]
           << setw(10) << status[runCount][1] << endl;
       runCount++;

   }
}

// main function
int main()
{
   // Declare array variables
   string names[COUNT];
   double milesStatus[COUNT][DAYS];
   double output[COUNT][2];
   // call the function
   inputData(names, 5, milesStatus, 5);
   computeMiles(output, milesStatus, 5);
   displayResult(output, names, 5);

   // pause the system
   system("PAUSE");
   return 0;

}

Answer 1

/* IDEA BEHIND 1-D ARRAY IS TO ACCESS ONE ROW OF TABLE AND 2D ARRAY IS A MATRIX OF GIVEN ROW AND COLUMNS */

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

using namespace std;

// constant variable declaration
const int COUNT = 5;
const int DAYS = 7;

// This functions tores the names of runners and number of mils run each day
void inputData(string names[], int sizeOfName, double numOfMiles[][DAYS], int rowSize)

{
//Create input file name
ifstream infile;
infile.open("Lab9_data.txt "); // opening file
//declaring variable
int checkNames = 0, checkMiles = 0;
//looping 0 to 5
while (checkNames < sizeOfName)
{
    //coping 1 runner name from file to names array
infile >> names[checkNames];
while (checkMiles < DAYS)
{
    // coping 1 total miles to numofMiles array
infile >> numOfMiles[checkNames][checkMiles];
checkMiles++; //increaing column
}
checkMiles = 0;
checkNames++;// increasing names array index

}
}

/* This function is to find the total miles run by each runner and the
avg number of miles run each day*/

void computeMiles(double status[][2], double numOfMiles[][DAYS], int rowSize)
{
// declare variables
double total = 0, avg = 0;
int runCount = 0, num = 0;

cout << fixed << showpoint << setprecision(2) << endl;
//running loop from 0 to 5
while (runCount < rowSize)
{
    //calculating total of nummofmiles
while (num < DAYS)
{
        //Accessing numfofMiles[0][0] index of numofMiles array and increasing it
total = total + numOfMiles[runCount][num];
num++;//increasing index
}
avg = (total / DAYS);
//status is 5 row two column matrix
status[runCount][0] = total; // coping total in status matrix[0][0]
status[runCount][1] = avg; // copying avg in status matrix[0][1]
total = 0;
avg = 0;
num = 0;
runCount++;//increasing row count
}
}

// function displays runner's names, total miles and avg of runners
void displayResult(double status[][2], string names[], int sizeOfName)
{
cout << setw(10) << "Runner Name" << setw(12)
<< "Total miles" << setw(10) << "Average" << endl;
int runCount = 0;
// looping from o to 5
while (runCount < sizeOfName)
{
    // printing runner's name at 0 index first and increasing print total of index 0
cout << setw(10) << names[runCount] << setw(12) << status[runCount][0]
<< setw(10) << status[runCount][1] << endl;
runCount++;

}
}

// main function
int main()
{
// Declare array variables
// declaring 1D string array of 5 names
string names[COUNT];
// declaring 2D matrix of of 5 rows 7 columns
double milesStatus[COUNT][DAYS];
// declaring 2D matrix of of 5 rows 2 columns
double output[COUNT][2];
// call the function
inputData(names, 5, milesStatus, 5);
computeMiles(output, milesStatus, 5);
displayResult(output, names, 5);

// pause the system
system("PAUSE");
return 0;

}

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