Write a gradebook application that offers the user the following menu: 1. Creat

Question

Write a gradebook application that offers the user the following menu:

1. Creat a grade file for a class

2. Display gradebook for a class

3. Claculate the averages for a class

4. Exit

The program should continue to execute until the user terminates by selecting choice 4.  If choice 1 is selected, the user should be prompted for each students name and four test grades, then create a file composed of this information with a filename selected by the user.  If the user selects choice 2, the program should prompt for the name of the grade file, read each student and his/he grades, and print the information on the screen.  If the user selects choice 3, the program shhould prompt for the name of the grade file, then read each student and his/her grades, calculate the student's average, and print the student's name and average.

I have a couple problems.  No matter what number I input, the program will always select choice 1.  When I'm in choice 1 the file that is created has nothing in it.  Below is my program and I hope someone can correct it.

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

int menu(void)
{

    int user_input=0;

    cout << "Select one of the following by selecting the corresponding number." << endl;
    cout << "1. Create a grade file for a class." << endl;
    cout << "2. Display the gradebook for a class." << endl;
    cout << "3. Calculate averages for a class." << endl;
    cout << "4. Exit" << endl;

    cin >> user_input;

}
int main ()
{
    string first, last, filename, input_file, average_file, temp;
    int g1, g2, g3, g4, i, students, user_input;
    char x;
    
    while(user_input=menu()!=4)
    {    
    if (user_input == 1)
    {
        ofstream gradeFile;

        cout << "What would you like to call this file?" << endl;
        cin >> filename;
        getline(cin,filename);
        
        gradeFile.open(filename.c_str());
        cout << "Select how many students you would like to enter." << endl;
        cin >> students;

        for(i=1; i<=students; i++)
            {
                cout << "Enter student " << i << "'s name (first name, last name) :" << endl;
                cin >> first >> last;
                gradeFile << "Student " << i << "'s name: " << first << " " << last << endl;
                cout << "Enter student " << i << "'s grades :" << endl;
                cin >> g1 >> g2 >> g3 >> g4;
                gradeFile << "The grades are: " << g1 << ", " << g2 << ", " << g3 << ", " << g4 << endl << endl;
            }
            
            gradeFile.close();
    }

    else if (user_input == 2)
    {
        ifstream gradeData;

        cout << "Enter the name of the grade file you are trying to access." << endl;
        cin >> input_file;
        getline(cin,input_file);
        gradeData.open(input_file.c_str());

        while(gradeData >> first >> last >> g1 >> g2 >> g3 >> g4)
        {
            cout << "Name: " << first << " " << last << endl;
            cout << "Grades: " << g1 << ", " << g2 << ", " << g3 << "," << g4 << endl;    
        }
        
        gradeData.close();    

    }

    else if (user_input == 3)
    {
        ifstream averageData;

        cout << "Enter the name of the grade file you are trying to access." << endl;
        cin >> average_file;
        getline(cin,average_file);

        averageData.open(average_file.c_str());

        while(averageData >> temp >> temp >> temp >> first >> last >> temp >> temp >> temp >> g1 >> x >> g2 >> x >> g3 >> x >> g4)
        {
            float sum = g1 + g2 + g3 + g4;
            cout << "Name: " << first << " " << last << ", Average: " << sum / 4 << endl;
        }

        averageData.close();
    }
    
    else if (user_input == 4)
    {
        return 0;
    }
    
    else
    {
        cout << "Invalid entry, please try again." << endl;
    }
    }
}

Explanation / Answer

You don't need to use getline because you are already using cin>>filename.

It worked if you remove getline function

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