Question

Write a program to compute numeric grades for a course. The course records are in a file that will serve as the input file. The input file is in exactly the following format:

Each line contains a student’s last name, then one space, followed by the student’s first name, then one space, then ten or fewer quiz scores.

(If there are fewer than ten scores, that means the student missed one or more quizzes.) The quiz scores are whole numbers and are separated by one space. Your program will take its input from this file and send its output to a second file. The data in the output file will be the same as the data in the input file except that there will be one additional number (of type double) at the end of each line. This number will be the average of the student’s quiz scores. The average score is the sum of the quiz scores divided by 10. This amounts to giving the student a 0 for any missed quiz.

The output file will contain a line (or lines) at the beginning of the file explaining the output. Use formatting instructions to make the layout neat and easy to read.

After placing the desired output in an output file, your program will close all files and then copy the contents of the output file to the input file so that the net effect is to change the contents of the input file.

Use at least two functions that have file streams as all of some of their arguments.

Hint: Check out putback member function. See topic in Files menu.

SAMPLE OUTPUT

Input file:

test_ line_ 10 20 30 40 50 60 70

Price Betty 40 50 60 70 60 50 30 60 90

Goodman John 60 70 80 90 100 90

Smith Charles 70 80 90 60 70 60 80 90 90 90

Spangenberg Ward 70 70 80 90 70 80 90 80 70 60

Output file:

Last Name, First Name, up to 10 quiz scores. last entry is the average.

test_ line_ 10 20 30 40 50 60 70 28.00

Price Betty 40 50 60 70 60 50 30 60 90 51.00

Goodman John 60 70 80 90 100 90 49.00

Smith Charles 70 80 90 60 70 60 80 90 90 90 78.00

Spangenberg Ward 70 70 80 90 70 80 90 80 70 60 76.00

Point Distribution:

-50 Does not compile

-5 Warnings

-5 No description multiple line comments (name, date, etc)

-5 No single line comments (logic, input, output, etc)

-20 Does not use at least 2 programmer defined functions with stream passing.

-10 Does not copy output file to input file

-10 Does not format output

can you please send the answer to my emil [email protected]

thank you

C++

C++

Answer 1

Code:

Code as text:

#include <iostream>

#include <fstream>

#include <sstream>

#include <iomanip>

using namespace std;

int main() {

// open the files

ifstream infile("input.txt");

ofstream outfile("output.txt");

string line;

// read each line from file and process it

while (getline(infile, line)) {

istringstream data(line);

string lname, fname;

int score;

// read names

data >> lname >> fname;

outfile << lname << " " << fname << " ";

double average = 0;

// read scores

while (data >> score) {

outfile << score << " ";

average += score;

}

// calculate average

average = average / 10;

outfile << fixed << setprecision(2) << average << "\n";

}

// close files

infile.close();

outfile.close();

// reopen files to write back to input file

infile.open("output.txt");

outfile.open("input.txt");

while(getline(infile, line)) {

outfile << line << endl;

}

// close files

infile.close();

outfile.close();

return 0;

}

Sample run:

Input.txt

Output.txt

Changed input.txt: