Bdtjtk

Why am I getting the following error with Xcode?

Undefined symbols for architecture x86_64:

  "displayFile()", referenced from:

      _main in main.o

  "quitProgram(bool&)", referenced from:

      _main in main.o

  "editFile()", referenced from:

      _main in main.o

  "openFile()", referenced from:

      _main in main.o

  "saveFile()", referenced from:

      _main in main.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see 

invocation)

Here is the number_enforcer.hpp:

#ifndef number_enforcer_hpp

#define number_enforcer_hpp

 class Enforcer {

 private:

    int int_n;                                                                

    double n;

public:

     int natural_number_enforcer(int min, int max);

};

#endif /* number_enforcer_hpp */

The number_enforcer.cpp:

#include "number_enforcer.hpp"

#include <iostream>

using namespace std;



//***********************************************************************

// Definition of function natural_number_enforcer                            *

//                                                                            *

// forces input for a variable to be a natural number.                        *

// WARNING: Does not work for numbers too large for type int (32 bits)    *

//***********************************************************************



int Enforcer::natural_number_enforcer(int min, int max)

{

    do

    {

        if (cin >> n)                                                            // input n and see if input is a number

        {                                                                        // If n is a number, then:

        cin.ignore(1000000000000000000, 'n');                                // if first characters form a number,...

        // ...this ignores any extra junk typed after that number.

        int_n = n;                                                            // assigns input of type double to int_n of type int

        // int_n is the truncated version of n (if n is a decimal not too large for type int)

        if (n != int_n || n < min || n > max)                                            // Test if n is a natural number (it should equal the truncated version int_n and be greater than 1).

        {                                                                    // Otherwise, n is not a natural number (or else n is too large for type int).

            cout << "nError: Input needs to be a whole number between " << min << " and " << max << "." << endl;

        }

        else                                                                // if inputed n is actually a natural number, then:

        {

            break;                                                                // quit the do-while loop and keep the acceptable input for n

        }

    }

    else                                                                // If n is not a number, then:

    {

        cout << "nA letter/punctuation is not a number.n";                // tell the user that their input was not a number

        cin.clear();                                                        // clear the input (or else the program will go crazy and repeat a part forever)

        cin.ignore(1000000000000000000, 'n');                                // ignore potential extra inputed junk as well

    }

    cout << "Enter a new number:t";                                // tell the user to input a natural number

    } while (true);                                                            // loop until user inputs a natural number

    return n;

}

And the main.cpp:

#include <iostream>

#include <fstream>

#include <string>

#include "number_enforcer.hpp"

using namespace std;

Enforcer enf; //calls to class Enforcer for managing input



//=======FUNCTIONS=======

void createFile(int (&x)[100]);

void saveFile();

void openFile();

void displayFile();

void editFile();

void quitProgram(bool &);

//=======================



int main() {

    int menuOption; //user-defined choice for Main Menu

    bool quit; //true --> quit program

    int scores[100]; //declare array for storing scores with a limit of 100 items



    do {

        //=======MAIN MENU=======

        cout << "What would you like to do?n" <<

                "1. Create New Filen" <<

                "2. Save Current Informationn" <<

                "3. Open Another Filen" <<

                "4. Display Current Scoresn" <<

                "5. Modify Certain Scoresn" <<

                "6. Quit" << endl;

        menuOption = enf.natural_number_enforcer(1, 6);

        switch (menuOption) {

            case 1:

                createFile(scores);

                break;

            case 2:

                saveFile();

                break;

            case 3:

                openFile();

                break;

            case 4:

                displayFile();

                break;

            case 5:

                editFile();

                break;

            case 6:

                quitProgram(quit);

                break;

            default:

                break;

        }



    } while (!quit);



    return 0;

}



void createFile(int (&x)[100]) {

    int subMenuOption; //user-defined choice for Sub Menu

    int numberOfScores; //user-defined amount of scores to store

    cout << "Are you sure you want to create a new file?n" <<

            "(This will overwrite any unsaved progress)nn" <<

            "1. Yesn" <<

            "2. No" << endl;

    subMenuOption = enf.natural_number_enforcer(1, 2);

    if (subMenuOption == 1) {



        cout << "How many scores do you wish to enter (up to 100)?: t";

        numberOfScores = enf.natural_number_enforcer(1, 100);

        for (int i = 0; i < numberOfScores - 1; i++) {

            cout << "Enter Score #" << i + 1 << ": t";

            x[i] = enf.natural_number_enforcer(0, 100000);

        }

         for (int i = 0; i < numberOfScores - 1; i++) {

             cout << x[i] << endl;

         }

    }

}

I just started my project before noticing this strange error. How to fix it?

I assume it has to do with my header files that I added, but I remember testing it before and it working. The only thing I added after that was the prototypes and the createFile() function, then suddenly it wouldn't build. I tried removing the createFile() function but to no avail.

You declared but not defined these functions:

void saveFile();

void openFile();

void displayFile();

void editFile();

void quitProgram(bool &);

You call the functions in your code, so linker tries to find their implementation and fails.

Just add definitions for the functions as you did for createFile.