Assigning data to member variables in a structure?

[kordric]

Hello Im trying to figure out how to do what the title says.
Here is what my structure looks like

//Structure for the Student Recored
struct studentRecord
{
    int studentID;
    string first_name;
    string last_name;
    int quiz1;
    int quiz2;
    int midTerm;
    int finalExam;
    int totalPoints;
    double percentTotal;
    char letterGrade;
};
 

The only data that will need to be assigned will be the:

studentID, quiz1, quiz2, midTerm, finalExam, 

because these are variables the user will input.

Also i need to be able to process multiple records, because more than one student will be entered. So my question about this is do i need to change my structure?

Please help!

Thank you.

[gpraghuram]

Hello Im trying to figure out how to do what the title says.
Here is what my structure looks like

//Structure for the Student Recored
struct studentRecord
{
    int studentID;
    string first_name;
    string last_name;
    int quiz1;
    int quiz2;
    int midTerm;
    int finalExam;
    int totalPoints;
    double percentTotal;
    char letterGrade;
};
 

The only data that will need to be assigned will be the:

studentID, quiz1, quiz2, midTerm, finalExam, 

because these are variables the user will input.


Also i need to be able to process multiple records, because more than one student will be entered. So my question about this is do i need to change my structure?

Please help!

Thank you.

The only data that will need to be assigned will be the:

studentID, quiz1, quiz2, midTerm, finalExam, 

because these are variables the user will input.

from where you will get other data?


Also i need to be able to process multiple records, because more than one student will be entered.

You can have array of these structures or a vector of this structure

Raghuram

[kordric]

I changed it a little,

//Structure for the Student Records
struct studentRecord
{
    int studentID;
    string first_name;
    string last_name;
    int quiz1;
    int quiz2;
    int midTerm;
    int finalExam;
 
};

int main()
{
    studentRecord student;
    get_data(student);
 
    int totalPoints;
    int totalPointsPossible;
    double percentTotal;
    char letterGrade;
 
    //Calculate Total Points
    // This adds together all quizes and exams
    totalPoints = student.quiz1 + student.quiz2 + student.midTerm + student.finalExam;
 
    //Calulate Percentage in class
    totalPointsPossible = 200;
    percentTotal = ((totalPoints / totalPointsPossible) * 100);
 
    //Figure out letter grade
    if (percentTotal>= 90)
    {
        letterGrade = 'A';                           
    }
    else if ((percentTotal>= 80) || (percentTotal < 90))
    {
         letterGrade = 'B';
    }
    else if ((percentTotal>= 70) || (percentTotal < 80))
    {
         letterGrade = 'C';
    }
    else if ((percentTotal>= 60) || (percentTotal < 70))
    {
         letterGrade = 'D';
    }
    else if (percentTotal<60)
    {
         letterGrade = 'F';
    }
 
 
 
    //Display Student Info
    cout << "\nStudent ID =  " << student.studentID <<"";
    cout << "\nFirst Name =  " << student.first_name <<"";
    cout << "\nLast Name =  " << student.last_name <<"";
    cout << "\nQuiz 1 Score =  " << student.quiz1 <<"";
    cout << "\nQuiz 2 Score =  " << student.quiz2 <<"";
    cout << "\nMid Term Score =  " << student.midTerm <<"";
    cout << "\nFinal Exam Score =  " << student.finalExam <<"";
    cout << "\nTotal Points =  " << totalPoints <<"";
    cout << "\nPercent Total =  " << percentTotal <<"%";
    cout << "\nLetter Grade =  " << letterGrade <<"\n";
 
    system("PAUSE");
    return 0;
}    

The studentRecord comes from

void get_data(studentRecord& the_student)    
{ 
    //Check student ID
    cout << "\nEnter Student Id\n";
    cin >> the_student.studentID;
    //Check for mistakes
    // Correct Value does this
    if ((the_student.studentID> 1) || (the_student.studentID < 99999))
    {
    }
    // Incorrect does this
    // A loop To validate the Student ID
    while ((the_student.studentID < 1) || (the_student.studentID > 99999)) 
    {
          cout <<"\nMust enter an Student ID between 1 and 99999.\n";
          cout <<"Re Enter Student ID:\n";
          cin >> the_student.studentID;
          cout <<"\n";
    } 
 
    //Get First and last names
    cout << "\nEnter First name\n";
    cin >> the_student.first_name;
 
    cout << "\nEnter last name\n";
    cin >> the_student.last_name;
 
 
    //Check Quiz 1 score
    cout << "\nEnter quiz 1 score\n";
    cin >> the_student.quiz1;
    //Check for mistakes
    // Correct Value does this
    if ((the_student.quiz1> 0) || (the_student.quiz1 < 25))
    {
    }
    // Incorrect does this
    // A loop To validate the quiz1
    while ((the_student.quiz1 < 0) || (the_student.quiz1 > 25)) 
    {
          cout <<"\nMust enter an quiz1 score between 0 and 25.\n";
          cout <<"Re Enter quiz1 score:\n";
          cin >> the_student.quiz1;
          cout <<"\n";
    } 
 
    //Check Quiz 2 score
    cout << "\nEnter quiz 2 score\n";
    cin >> the_student.quiz2;
    //Check for mistakes
    // Correct Value does this
    if ((the_student.quiz2> 0) || (the_student.quiz2 < 25))
    {
    }
    // Incorrect does this
    // A loop To validate the quiz2
    while ((the_student.quiz2 < 0) || (the_student.quiz2 > 25)) 
    {
          cout <<"\nMust enter an quiz2 score between 0 and 25.\n";
          cout <<"Re Enter quiz2 score:\n";
          cin >> the_student.quiz2;
          cout <<"\n";
    } 
 
    //Check Midterm
    cout << "\nEnter Mid Term score\n";
    cin >> the_student.midTerm;
    //Check for mistakes
    // Correct Value does this
    if ((the_student.midTerm> 0) || (the_student.midTerm < 50))
    {
    }
    // Incorrect does this
    // A loop To validate the midTerm
    while ((the_student.midTerm < 0) || (the_student.midTerm > 50)) 
    {
          cout <<"\nMust enter an midTerm score between 0 and 50.\n";
          cout <<"Re Enter a midTerm score:\n";
          cin >> the_student.midTerm;
          cout <<"\n";
    }
 
    //Check Final
    cout << "\nEnter Final Exam score\n";
    cin >> the_student.finalExam;
    //Check for mistakes
    // Correct Value does this
    if ((the_student.finalExam> 0) || (the_student.finalExam < 100))
    {
    }
    // Incorrect does this
    // A loop To validate the finalExam
    while ((the_student.finalExam < 0) || (the_student.finalExam > 100)) 
    {
          cout <<"\nMust enter an finalExam score between 0 and 100.\n";
          cout <<"Re Enter a finalExam score:\n";
          cin >> the_student.finalExam;
          cout <<"\n";
    }
}

Also the percentTotal is coming out as 0.
Edit: FIXED the above changed code to this.

percentTotal = ((totalPoints * 100) / totalPointsPossible);

also i added this after calcs.

    //Show to first decimal place.
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(1);

Also If i use an array for adding additional students can it be unlimited, or is there a way to add in a question at the end saying yes add or N for no.

Secondly i need to figure out a way to add all the scores of the students entered and have an average score of them.

I'm quite new to programing and this is all a learning experience for me.

Thank you!

[gpraghuram]

You calculate yhe percenttotal like this

percentTotal = ((totalPoints / totalPointsPossible) * 100);
 

but the totalPoints and totalPointsPossible are both ints and you wont have the decimal part for this.


Raghuram

[kordric]

Yes thanks, i changed those to double, so they would work properly.

Now need to figure out the rest!

I would like to use an array, but is there a way to have it automatically figure out how many entries there are? Cause they may vary each time

Would i need something like

const int number_of_students = (somehow add all entries together after confirming finish)
 

then the array would be like

int i, score[number_of_students], max;

[kordric]

For the numbers of students, just have a variable inside a loop increment every time the loop restarts.

For the high and low points, use an if statement to determine whether or not the total points is higher or lower than the previous one and store the new value it if it is.

For the average, just keep adding the total points every loop then divide it by the number of students.

Just some ideas, trying to figure out how to do them correctly.

Opps double post meant to edit.

[gpraghuram]

You can have a dynamic array to hold the same like

int *score = (int*)malloc(sizeof(struct) *number_of_students)
 

Raghuram

[kordric]

would that go under int main()?

[gpraghuram]

would that go under int main()?

You can have it there...
But this address has to be passed to the calling function if you are changing the values inside the calling function.


Raghuram

[kordric]

So should i go ahead and make another void function, bear with me here, like i said im just learning this stuff.

Thanks

[gpraghuram]

So should i go ahead and make another void function, bear with me here, like i said im just learning this stuff.

Thanks

You can do that way also, but if you are writing the code in main function itsef.
Better write the code and post me, so i can take a look into it

Raghuram

[kordric]

You can do that way also, but if you are writing the code in main function itsef.
Better write the code and post me, so i can take a look into it

Raghuram

I need a new structure first, but how does it determine how many entries to save, since it may change each time?

Also the program must prompt the keyboard operator to determine whether there is another student to be processed, if not, display results, but i cant figure out what i need to do for this part.

So far heres what i have,
The Structure

struct allstudentRecord
{
    int totalStudents;
    int highestPoints;
    int lowestPoints;
    int avgTotalPoints;
    char avgLetterGrade;
 
};

Then i create a void

void get_allData (allstudentRecord& allthe_student)
{
      int *allthe_student.score = (int*)malloc(sizeof(struct) *allthe_student.totalStudents)

But i got stuck here cause the declaration of allthe_student shadows a parameter. So im not sure what to do.