What does the error code 999 mean?

In C++, what does this error mean and how do you fix it part 3 (code include)?

• The Code: Please ignore the comments #include <iostream> // Provides input and output fundamentals #include <cstdlib>// Allows the code: system("pause") to be use in this program #include <fstream> /* library containing input and output functions to read to or from a file*/ #include <iomanip>/* This will allow you to the code called setprecision(n) in in the program*/ #include <string>/* Allow you to directly initialize, assign, compare, and reassign with the intuitive operators, as well as printing and reading*/ using namespace std; /* allow the user to group entities like classes, objects and functions under a name ithout the prefix std:*/ /* The code below states an void function named calculateAverage which is given the formal parameter list named ifstream&, ofstream&, and double& */ void calculateAverage ( ifstream&, ofstream&, double& ); /* The code below states an return value function type char named calculateGrade with the parameter list named double totalAvg */ char calculateGrade (double totalAvg); int main() {// Start of function main string name;// States an string variable named name double scoreAvg;// States an double variable named scoreAvg which is given no value double average=0;//States an double variable named average which is given the value of 0 int counter=0;// States an int variable named counter which is given the value of 0 ifstream inFile;// States an ifstream variable named inFile ofstream outFile;// States an ofstream variable named outFile inFile.open("courseScoreData.txt");/* Opens the data from the the file named courseScoreData and outputs the values*/ outFile.open("courseScoreResults.txt")... Opens the file named courseScoreResults and stores the values into it */ if (inFile.fail()) // if inFile fails to open it should output the following statement {// Start of if statement //The code below outputs the statement to let the user know that the infile fail to open and must be check cout<<"INPUT FAIL TO OPEN, PLEASE CHECK IT"<<endl; system("pause");// pause the system until you press enter return 1;// }// End of if statement outFile<< fixed; outFile.precision(2); /* The code below output the following statement: Student TestOne TestTwo TestThree TestFour TestFive Average Grade */ outFile<<"Student TestOne TestTwo TestThree TestFour TestFive Average Grade"<<endl; while ( true ) {// Start of while loop inFile >> name; if ( !inFile ) break; outFile << setw( 10 ) << left << name; calculateAverage ( inFile&, outFile&, double&); << The Problem outFile << setw( 10 ) << right << scoreAvg; outFile << setw( 6 ) << right << 'calculateGrade( scoreAvg)'<<endl; counter++; average += scoreAvg; }// End of While loop //Outputs Results average = average/counter; outFile << endl << "Class Average = " << average; inFile.close( ); outFile.close( ); system("pause");// Pause the system until you press enter return 0;// Ends the program }// End of function main //A function to calculate the average test score void testScoreAverage( ifstream& input, ofstream& output, double& scoreavg ) { scoreavg=0; int score; for ( int i = 0; i < 5; i++ ) { input >> score; output << setw( 7 ) << right << score; scoreavg += score; } scoreavg =scoreavg/ 5.0; } //A Returning Value Function to calculate the test score grade char testScoreGrade( double totalAvg ) { if ( totalAvg >=90 ) return 'A'; else if ( totalAvg >=80 ) return 'B'; else if ( totalAvg>=70 ) return 'C'; else if ( totalAvg >=60 ) return 'D'; else return 'F'; } ______________________________________... Error Message: undefined reference to `calculateAverage(std::basic_ifstream<ch... std::char_traits<char> >&, std::basic_ofstream<char, std::char_traits<char> >&, double&)'| Hope someone can help

• Answer:

  Your problem is the function call calculateAverage ( inFile&, outFile&, double&); the function expects a reference to an ifstream, a reference to an ofstream, and a reference to a double. Not literally '<ifstream>&' your function call should look something like calculateAverage ( inFile, outFile, scoreAvg); instead (replace scoreAvg with whatever variable you actually need to use)