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Initializing class with string constructor?

Jun 13, 2020 at 1:20am
dakotad8218 (50)
Hi, trying to make a class with some member functions that basically just gathers a name from the declaration and allows you to add_quiz(int score) and get the average. The only issue is, since I'm dividing two integers, I'm getting flat .00 doubles as output. Should I change the divisor or dividend to a double to fix this? Also I'm having issues getting the get_name() member function to work correctly, when I call it I get no output. Is there something different I need to do with the class constructor? Thanks in advance for any help.

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  #include <iostream>
#include <string>
#include <iomanip>

using namespace std;

class Student
{

public:     //public interface

    /**Constructor that initializes an object with private data member 'string name = "name"'
     * @param name >> Student's name
     */
    Student(string name);

    /**Function that returns the name of the student in the given object
     * @return name >> Student's name
     */
    string get_name() const;

    /**Adds a quiz to the score total and increments the amount of quizzes submitted
     * @param score >> quiz score
     */
    void add_quiz(int score);

    /**Returns the total score of all quizes for the particular object
     * @return total_score >> sum of all quiz scores
     */
    int get_total_score() const;

    /**Returns average score of all quizzes
     * @return average >> average quiz score as double 
     */
    double get_avg_score() const;

private:        //private data members

    string name;
    int total_score = 0;
    int number_of_quizzes = 0;

};

Student::Student(string name)
{   
    total_score = 0;
    number_of_quizzes = 0;
}

void Student::add_quiz(int score)
{
    number_of_quizzes++;
    total_score += score;
}

string Student::get_name() const
{
    return name;
}

int Student::get_total_score() const
{
    return total_score;
}

double Student::get_avg_score() const
{
    double average = total_score / number_of_quizzes;
    return average;
}

int main()
{
    Student steve("Steve");
    Student karen("Karen");
    steve.add_quiz(90);
    steve.add_quiz(95);
    steve.add_quiz(84);
    steve.add_quiz(49);
    int totscore = steve.get_total_score();
    double avgscore = steve.get_avg_score();
    

    cout << "Total of all " << steve.get_name() << "'s Test Scores: " << totscore << endl;
    cout << fixed << setprecision(2) << steve.get_name() << "'s Average Quiz Score: " << avgscore << endl;



    return 0;
}
Edit & Run


This gives me an output of

Total of all 's Test Scores: 318
's Average Quiz Score: 79.00
Last edited on Jun 13, 2020 at 1:22am
Jun 13, 2020 at 2:16am
helios (17607)
The only issue is, since I'm dividing two integers, I'm getting flat .00 doubles as output. Should I change the divisor or dividend to a double to fix this?
Yes.

Also I'm having issues getting the get_name() member function to work correctly, when I call it I get no output. Is there something different I need to do with the class constructor?
You're accepting an std::string in the constructor, but you're not doing anything with it. The language isn't going to assign that value to a member just because you gave the formal parameter the same name as the class member. You need to actually perform the initialization.
Jun 13, 2020 at 3:13am
dakotad8218 (50)
Yep, that did 'er. Thanks.
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