parameter passing..??

This is a discussion on parameter passing..?? within the C++ Programming forums, part of the General Programming Boards category; I am having trouble figuring out how to get this program to work correctly and was wondering if someone could ...

  1. #1
    UpTooLate
    Join Date
    Feb 2008
    Location
    New York
    Posts
    32

    Question parameter passing..??

    I am having trouble figuring out how to get this program to work correctly and was wondering if someone could give me a little guidance? I know the problem is in the last function Grade::getWeightedGrade() but I can't figure out what I am doing wrong. The program runs correctly but instead of returning the right score it returns zero. The score is supposed to be based upon the ( score of the test * (weight / 100) for both grade1 and grade2 and then these totals are added together to give the final score....
    Here is what it should run like:
    Enter Type: Midterm
    Enter Score: 86
    Enter Weight: .40

    Enter Type: Final
    Enter Score: 97
    Enter Weight: .60

    Your grades are as follows:
    Midterm 86, which counts 40%
    Final 97, which counts 60%
    Your final grade is: 92.6




    Code:
    #include <iostream>
    #include <string>
    
    using namespace std;
    
    class Grade
    {
          public:
                 void enterGradeInfo();
                 void showGradeInfo();
                 double getWeightedGrade();
                 
                 
          private:
                  int mWeight;
                  int mScore;
                  string mType;             
    };
    
    int main()
    {
        Grade grade1;
        Grade grade2;
        grade1.enterGradeInfo();
        grade2.enterGradeInfo();
        cout << "Your grades are as follows:" << endl;
        grade1.showGradeInfo();
        grade2.showGradeInfo();
        cout << "Your final grade is " <<  grade1.getWeightedGrade + grade2.getWeightedGrade;    
        cout << endl;
     
      
        system("pause");
        return 0;
        
        
    }
    
    void Grade::enterGradeInfo()
    {
         cout << "Enter type: ";
         cin >> mType;
         cout << endl;
         cout << "Enter Score: ";
         cin >> mScore;
         cout << endl;
         cout << "Enter weight: ";
         cin >> mWeight;
         cout << endl;
    }
     
    
    void Grade::showGradeInfo()
    {
         cout << mType << " which counts for " << mWeight << "%" << endl;
    }     
    
    double Grade::getWeightedGrade()
    {
         return mScore * (mWeight/100) ;       
    }

  2. #2
    Registered User
    Join Date
    Jun 2007
    Posts
    41
    Without looking too much could it be precision of your variables?

    int mWeight;
    int mScore;
    it could be rounding your math off to ZERO ?

    try switching them to double or

    Code:
    mScore * (mWeight/100.0f)
    or
    float(mScore) * (mWeight/100.0f)
    mWeight/100 = 0.5 = round off to zero I'm guessing
    m_Score * 0 = ZERO
    etc..
    Last edited by HyperShadow; 02-27-2008 at 08:38 PM.

  3. #3
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,650
    getWeightedGrade is a method, and needs to be called like this (you forgot the parentheses):

    Code:
    cout << "Your final grade is " <<  grade1.getWeightedGrade() + grade2.getWeightedGrade();

  4. #4
    UpTooLate
    Join Date
    Feb 2008
    Location
    New York
    Posts
    32

    Wink thank you

    wow one little decimal after all of that.... thank you so much

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