Question

CIS 22A C++

Project Exam Statistics
Here is what your program will do: first it welcomes the user and displays the purpose of
the program. It then prompts the user to enter the name of an input file (such as
scores.txt). Assume the file contains the scores of the final exams; each score is
preceded by a 5 characters student id. Create the input file: copy and paste the following
data into a new text file named scores.txt
DH232 89
DR123 100
AJ222 98
SW111 45
12AB1 82
516BC 99
2ABCD 100
333XY 92
TY4XZ 45
AC234 78
9QWE9 45
JP200 89
AK323 100
The program should read the contents of the file into two arrays, determine what needs to
be determined, and displays the following results:
• The total number of students in the array
• The class average
• The lowest score in the array followed by the ids of the students with that
score
• The highest score in the array followed by the ids of the students with that
score
Finally, the program should write to another file the scores below the average, and the
corresponding ids. The program prompts the user to enter the name of an output file
Design: Your program should include several functions in addition to main()
// NOTE: You must write documentation for each function!
Pseudocode: // see next page
Pseudo-code:
1. Display welcome & info about the program
2. Create 2 arrays in main (assume the maximum class size is 45)
3. Read data from file into two arrays and also count the number of students in the input
file.
4. Calculate the class average
5. Find the lowest score
6. Find the highest score
7. Display the average and the number of students
8. Display the lowest score followed by the ids of the students with that score
9. Display the highest score followed by the ids of the students with that score
10. Write to another file the scores below the average, and the corresponding ids. The
program prompts the user to enter the name of an output file
11. Display an “end of the program” message.

Answer 1

Here is the code for the above assignment.

Feel free to comment on any doubt and give thumbs up!

Code:

#include <iostream>

#include <sstream>

#include <string>

#include <fstream>

using namespace std;

// constant variable for the size of the array

const int MAX_SIZE = 45;

/*

this function takes two arguments

an array of integer type and number of elements in the array

and return the lowest element in the array

*/

int findLowestScore(int score[] , int size)

{

int lowest = score[0];

for (size_t i = 1; i < size; i++)

{

if (score[i] < lowest)

{

lowest = score[i];

}

}

return lowest;

}

/*

this function takes two arguments

an array of integer type and number of elements in the array

and return the highest element in the array

*/

int findHighestScore(int score[] , int size)

{

int highest = score[0];

for (size_t i = 1; i < size; i++)

{

if (score[i] > highest)

{

highest = score[i];

}

}

return highest;

}

/*

this function takes two arguments

an array of integer type and number of elements in the array

and return the average

*/

double calculateAverage(int score[] , int size)

{

double sum = 0.0;

for (size_t i = 0; i < size; i++)

{

sum += score[i];

}

return sum / size;

}

/*

this function takes four arguments

an 2D array of char type, an array of integer type, number of elements in the array and lowest marks

and display the student IDs with the lowest marks

*/

void displayLowestScore(char data[][6] , int score[] , int size , int lowest )

{

cout << "Lowest score in the class is : " << lowest << endl;

cout << "Student IDs with the lowest score are : " << endl;

for (int i = 0; i < size; i++)

{

if(score[i] == lowest){

cout << data[i] << "\n";

}

}

}

/*

this function takes four arguments

an 2D array of char type, an array of integer type, number of elements in the array and highest marks

and display the student IDs with the highest marks

*/

void displayHighestScore(char data[][6] , int score[] , int size , int highest)

{

cout << "Highest score in the class is : " << highest << endl;

cout << "Students IDs with the highest score are : " << endl;

for (size_t i = 0; i < size; i++)

{

if(score[i] == highest){

cout << data[i] << endl;

}

}

}

// main method

int main()

{

cout << "************Welcome***************************\n";

cout << "This program reads information of students \nfrom file and calculates various statistics from the data!\n";

cout << "**********************************************\n\n";

cout << "Enter name of an input file\n";

string fileName ;

getline(cin , fileName);

ifstream fin;

fin.open(fileName);

if (!fin.is_open())

{

cout << "Error! File not found!\n";

exit(1);

}

char data[MAX_SIZE][6];

int score[MAX_SIZE];

int numberOfStudents = 0;

while (!fin.eof())

{

fin >> data[numberOfStudents];

fin >> score[numberOfStudents];

data[numberOfStudents][5] = '\0';

++numberOfStudents;

}

fin.close();

int lowestScore = findLowestScore(score , numberOfStudents);

int highestScore = findHighestScore(score , numberOfStudents);

double classAverage = calculateAverage(score , numberOfStudents);

cout << "Total number of students : " << numberOfStudents << endl;

cout << "Average of class : " << classAverage << endl;

cout << endl;

displayLowestScore(data,score,numberOfStudents,lowestScore);

cout << endl;

displayHighestScore(data,score,numberOfStudents,highestScore);

string outputFileName ;

cout << endl << "Enter the name of output file: \n" ;

getline(cin,outputFileName);

ofstream fout(outputFileName);

if(!fout.is_open()){

cout << "Error! Cannout open file!\n";

exit(1);

}

for (size_t i = 0; i < numberOfStudents; i++)

{

if(score[i] < classAverage){

fout << data[i] << " " << score[i] << endl ;

}

}

fout.close();

}

Screenshot

Thank You!