In the following program, we are supposed to read in 20 scores from the user, an

Question

In the following program, we are supposed to read in 20 scores from the user, and then check these 20 scores against a data file with the correct answers. After this is done, the program returns the users score (out of 20) and says whether they pass or fail.

I have everything done, except I cannot seem to get "numCorrect" to pass into the next function. If I print out "numCorrect" in the "checkScores" function, it returns the right value. However, if I print out "numCorrect" in the next function (passFail), then it just prints a zero. Why is this?

Source code:
#include<iostream>
#include<fstream>
#include<cstdlib>

using namespace std;

char scores[20];
char answer;

int numCorrect = 0;

void getScores(char []);
int checkScores(char [], char, int);
void passFail(int);



int main() // Main function

{

cout << "---- Driver's License Exam Grader ---- ";
cout << "Please enter the answers to grade the exam ";


getScores(scores); // Calls getScores function

checkScores(scores, answer, numCorrect);

passFail(numCorrect);



return 0;

}


void getScores(char scores[]) // Function to read the student's scores

{

for (int count = 1; count <= 20; count++) // Read 20 scores from user
{
cout << "Please enter the score of student " << count << ": ";
cin >> scores[count];

while ((scores[count] != 'A' && scores[count] != 'B' && // Validate input
scores[count] != 'C' && scores[count] != 'D'))
{
cout << "Please enter A, B, C or D (upper case): ";
cin >> scores[count];
}
}

}


int checkScores(char scores[], char answer, int score)
// Function to check entered
// scores against correct scores

{

int count = 0;

ifstream inputFile;
inputFile.open("answerkey.dat");


while (count < 20 && inputFile >> answer)
{

if (scores[count] == answer)
score++;

count++;

}

// cout << numCorrect << " ";

inputFile.close();

}


void passFail(int numCorrect)

{


cout << "Your score was " << numCorrect << "/20. ";

if (numCorrect >= 15)
cout << "You passed the test! ";
else
cout << "You failed, please try again ";

}

Explanation / Answer

You need to pass numCorrect by reference.

int checkScores(char [], char, int&);

and
int checkScores(char scores[], char answer, int &score)

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