Question

This output should also be printed to the screen.

An Array Program for Grading Utilizing Data Files

Create 2 text files:

• The first will be a “settings” file – Arrange this file so that it has two numbers on separate lines – the first number will represent the number of students in this class (25). The second number will represent the total number of points on a fictional “exam”
• The second text file will be 25 “scores” for the test. These can be arranged on one line or with a new line for each...

Create a program that:

• Reads the values from the “settings” file for how many students and total points for the test
• Reads the values for the student’s scores into an array from the data file
• Calculates the average for each student on the test
• Creates an output file that prints a line for each student that shows the following:

Student 1 – 55 out of 100 – 55%

Student 2 – 87 out of 100 – 87%

Student 3 – 98 out of 100 – 98%

.

.

Average Score: 86.2%

This output should also be printed to the screen.

Answer 1

Source Code in C++:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
ifstream in("settings.txt"); //opening file for input
if(in.is_open())
{
int n,total;
in >> n >> total;
ifstream in("scores.txt"); //opening file for input
if(in.is_open())
{
ofstream out("scoresAverage.txt"); //opening file for output
int scores[n],i;
for(i=0;i<n;i++)
in >> scores[i];
double totalAv=0.0;
for(i=0;i<n;i++)
{
double av=scores[i]*100.0/total;
out << "Student " << i+1 << " - " << scores[i] << " out of " << total << " - " << av << "%" << endl; //output to file
cout << "Student " << i+1 << " - " << scores[i] << " out of " << total << " - " << av << "%" << endl; //output to screen
totalAv+=av;
}
out << "Average Score: " << totalAv/n << "%" << endl; //output to file
cout << "Average Score: " << totalAv/n << "%" << endl; //output to screen
}
else
cout << "Cannot open scores file"; //error message
}
else
cout << "Cannot open settings file"; //error message
return 0;
}

Output to screen:

Output to file: