Error

This is a discussion on Error within the C++ Programming forums, part of the General Programming Boards category; Unresolved External 'menu(double, double, double&)' referenced from ... what does this mean in simple language...

  1. #1
    Registered User
    Join Date
    Sep 2002
    Posts
    72

    Error

    Unresolved External 'menu(double, double, double&)' referenced from ...

    what does this mean in simple language

  2. #2
    Registered User
    Join Date
    Jun 2002
    Posts
    230
    It can depend. maybe if you should us the code we can help better but like this its hard to tell. Could be a problem with your function.
    C++ Rules!!!!
    ------------
    Microsoft Visual Studio .NET Enterprise

  3. #3
    Registered User
    Join Date
    Sep 2002
    Posts
    72
    ill post it all... :/

    This is spree.cpp:

    Code:
    //Program Name: spree.cpp//
    //Revision Date: 2002-11-08//
    //Explanation: To create a shopping spree program//
    
    #include <conio.h>
    #include <iostream.h>
    #include <string.h>
    #include <iomanip.h>
    #include "center.h"
    #include <time.h>
    #include <stdio.h>
    #include "select.h"
    #include "choice.h"
    
    
    void fowler()
    {
       clrscr();
    
    	time_t t=time(NULL);
    									//Fowler Statement//
    	cout << setiosflags(ios::right|ios::fixed);
    	cout << setprecision(2) << endl;
    	cout << setw(79) <<ctime(&t)<< endl;
    									//Personal Center Function in "center.h" //
    	center("Shopping Spree Program",6);
    	center("~~~~~~~~~~~~~~~~~~~~~~",7);
    	cout << endl;
    	cout << "Explanation:" << endl;
    	cout << "~~~~~~~~~~~~" << endl << endl;
    	cout << "Using variables and while looping structures display the outcome of a shopping "<<endl;
    	cout << "spree. The following assignment will demonstrate a program structure, code "<< endl;
    	cout << "layout and use logic structures and looping structures.The program will use "<<endl;
    	cout << "data derived from a user and date acquired from the system at time of execution"<<endl;
    	center("Press Any Key To Continue...",17);
    
    	getch();                //Pause Screen//
    	clrscr();              	//clear screen//
    }
    
    void input(char *first,char *last,double& winning_amount)
    {
    
    
       time_t t=time(NULL);
       clrscr();
    	cout << ctime(&t) << endl;
       center("Shopping Spree",3);
       center("~~~~~~~~~~~~~~",4);
       cout << endl;
       cout <<"What is your name( first last): " ;
       cin >>first;
       cin >> last;
       cout <<"How much won in contest: ";
       cin >> winning_amount;
       center("Press Any Key To Continue...",13);
    
       getch();
       clrscr();
    }
    
    
    
    int main()
    {
    double winning_amount = 200;
    double total = winning_amount;
    double nettotal;
    menu(winning_amount,total,nettotal);
    
    
    }
       								//variable declarations//
    This is select.cpp and select.h:

    Code:
    #include "select.h"
    #include <iostream.h>
    #include <time.h>
    #include <conio.h>
    #include "center.h"
    #include "choice.h"
    
    void menu(double winning_amount, double total,double &nettotal)
    {
       int ch;
       time_t t=time(NULL);
       cout <<ctime(&t) << endl;
       cout << endl;
    	center("Shopping Spree Program",3);
       center("~~~~~~~~~~~~~~~~~~~~~~",4);
       cout << endl;
       cout << "a.\tComputer Shop" << endl;
       cout << "b.\tTotal" << endl;
       cout << "c.\tQuit" << endl;
     	for(/*forever*/;((ch = getch()) != EOF);)
       switch(ch)
       {
       case 'a' :
       	choicecomp(winning_amount,total,nettotal);
       	break;
       default :
       	cout << "Bye Bye" << endl;
          getch();
          break;
       }
    
    }

    Code:
    #ifndef _SELECT_H
    #define _SELECT_H
    
    void menu(double winning_amount, double total,double &nettotal);
    
    #endif
    Next is choice.h and choice.cpp

    Code:
    #ifndef CHOICE_H
    #define CHOICE_H
    
    void choicecomp(double winning_amount, double total,double &nettotal);
    
    #endif
    Code:
    #include "select.h"
    #include "center.h"
    #include <time.h>
    #include <iostream.h>
    #include <conio.h>
    #include "section.h"
    
    void choicecomp(double winning_amount, double total,double & nettotal)
    {
       double CompChoice;
       do
       {
    
    	time_t t=time(NULL);
       center("Shopping Paradise - Winner's Circle",3);
       center("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~",4);
       cout <<" 1.\tHard Drive" << endl;
       cout <<" 2.\tFloppy Disk" << endl;
       cout <<" 3.\tCD Burner " << endl;
       cout <<" 4.\tBlank CDs " << endl;
       cout <<" 5.\tMonitor " << endl;
       cout <<" 6.\tSpeakers" << endl;
       cout <<" 7.\tVideo Card" << endl;
       cout <<" 8.\tGlass Case" << endl;
       cout <<" 9.\tWireless Keyboard" << endl;
       cout <<"10.\tWireless Mouse " << endl;
       cout <<"11.\tComputer Table " << endl;
       cout <<"12.\tWindows XP Home " << endl;
       cout <<"13.\tMotherboard " << endl;
       cout <<"14.\tRogers @Home Starter Kit " << endl;
       cout <<"15.\tMicrosoft Works XP" << endl;
       cout <<"16.\tBorland C++ v. 6.0" << endl;
       cout <<"17.\tRouter" << endl;
       cout <<"18.\tNetwork Hub + Ethernet Card" << endl;
       cout << endl;
       cout <<"What is your choice : ";
       cin >> CompChoice;
       if(CompChoice == 19)
       	menu(winning_amount,total,nettotal);
       if(CompChoice == 1)
         	total = total - 50;
       else if(CompChoice == 2)
         	total = total - 5;
       else if(CompChoice == 3)
         	total = total - 100;
       else if(CompChoice == 4)
         	total = total - 10;
       else if(CompChoice == 5)
         	total = total - 40;
       else if(CompChoice == 6)
         	total = total - 90;
       else if(CompChoice == 7)
         	total = total - 80;
       else if(CompChoice == 8)
         	total = total - 130;
       else if(CompChoice == 9)
         	total = total - 20;
       else if(CompChoice == 10)
         	total = total - 25;
       else if(CompChoice == 11)
         	total = total - 175;
       else if(CompChoice == 12)
         	total = total - 200;
       else if(CompChoice == 13)
         	total = total - 10;
       else if(CompChoice == 14)
         	total = total - 15;
       else if(CompChoice == 15)
         	total = total - 30;
       else if(CompChoice == 16)
         	total = total - 21;
       else if(CompChoice == 17)
         	total = total - 19;
       else if(CompChoice == 18)
         	total = total - 82;
       else
          	cout << "Sorry, That is an Invalid Selection..." << endl;
    	clrscr();
    
       cout<<total;
       }
    	while(total > 0);
    
       total = nettotal;
    
    
    
    }
    Finally, center.h...

    Code:
    #include <string.h>
    #include <conio.h>
    #include <iostream.h>
    
    #ifndef _CENTRE_H
    #define _CENTRE_H
    
    
    void center(char txt[60], int height)
    {
    	int number, spaces;
    
    	number = strlen(txt);
    	spaces = 40 - number/2;
    
    	gotoxy (spaces,height);
    	cout << txt << endl;
    }
    
    #endif
    I really need help with this, i've been working on this for a while, im a beginner, and i cant get it to run... any help would GREATLY appreciated, i dont want to get discouraged, only been doing C++ for about 2 weeks.Thanks
    Last edited by niroopan; 11-11-2002 at 07:32 PM.

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