Question

Modify the GPA Calculation program so that you input your grades from a file, Grades.txt. To include file I/O to your program, you must complete the following five steps: 1. Include the header file fstream in the program. 2. Declare file stream variable, ifstream inFile; 3. Associate the file stream variable with the I/O source. 4. Use the file stream variable with the extractor variable >> to get input. 5. Close the file. Use Dev c++ Visual Basic is not working

Answer 1

/**

This program calculates the GPA of a student

INPUT: A file containing grades and credit hours separated by comma

PROCESSING: A method getCreditPoints(char grade, int credit hours) which returns the corresponding total credit points (credit points for the grade * total credit hours for the course) associated with a particular grade

*/

#include <iostream>

#include <iomanip>

#include <fstream>

#include <sstream>

#include <cstdlib>

#include <vector>

using namespace std;

// function prototype

double getCreditPoints(char, int);

int main()

{

ifstream inFile("Grades.txt");

double totalCreditPoints = 0.0, GPA = 0.0;

int totalCreditHours = 0;

string line;

if(!inFile.is_open())

{

cout << "Cannot open file Grades.txt\n";

exit(0);

}

while(getline(inFile, line))

{

stringstream ss(line);

vector<string> tokens;

string token;

while(getline(ss, token, ','))

{

tokens.push_back(token);

}

char grade = tokens[0][0];

int creditHours = stod(tokens[1]);

totalCreditHours += creditHours;

double creditPoints = getCreditPoints(grade, creditHours);

totalCreditPoints += creditPoints;

cout << "Grade of = " << grade << " having credit hours of " << creditHours << " results to credit points of = " << creditPoints << endl;

}

inFile.close();

GPA = (totalCreditPoints / totalCreditHours);

cout << "\nThe GPA is = " << setprecision(2) << fixed << GPA << endl;

return 0;

}

double getCreditPoints(char grade, int creditHours)

{

double points = 0;

grade = toupper(grade);

if(grade == 'A')

points = (4.00 * creditHours);

else if(grade == 'B')

points = (3.00 * creditHours);

else if(grade == 'C')

points = (2.00 * creditHours);

else if(grade == 'D')

points = (1.00 * creditHours);

return points;

}

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CODE SNIPPET SCREENSHOT :

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