Unresolved External... -_-

This is a discussion on Unresolved External... -_- within the C++ Programming forums, part of the General Programming Boards category; My code and Errors are below, when I Build this I get the unresolved External errors, why? However, when I ...

  1. #1
    Comment your source code! Lynux-Penguin's Avatar
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    Unresolved External... -_-

    My code and Errors are below, when I Build this I get the unresolved External errors, why? However, when I Compile I don't get any errors...

    WHY!?
    Code:
    #include <iostream.h>
    #include <windows.h>
    #include <iomanip.h>
    double area_(const double&r);
    double area_(const double&h,const double&w);
    double area_(const double&b1,const double&b2, const double&h);
    int full_screen(void);
    int kill_cursor(void);
    void clrscrn(void);
    
    
    const double PI = 3.14159265358979323;
    
    
    int main(int argc, char* argv[])
    {
    	double price=0;
    	double r=0, height=0, width=0, base1=0, base2=0;
    	int choice;
    	clrscrn();
    	full_screen();
    	kill_cursor();
    	cout<<setprecision(2)<<setiosflags(0x1000 | 0x0100);
    	cout<<"Choose:"<<endl
    		<<"1. Circular Pizza Calculations.\n"
    		<<"2. Rectangular Pizza Calculations. \n"
    		<<"3. Trapazoidal Pizza Calculations. \n"
    		<<"choice: ";
    	cin>>choice;
    	cout<<"\n";
    	switch(choice)
    	{
    	case 1: cout<<"Enter the radius: ";
    		cin>>r;
    		cout<<"\n";
    		price = area_(r);
    		cout<<"The price per square inch is: "<<price<<endl;
    		break;
    	case 2: cout<<"Enter the height: ";
    		cin>>height;
    		cout<<"\nEnter the width: ";
    		cin>>width;
    		cout<<"\n";
    		price = area_(height,width);
    		cout<<"The price per square inch is: "<<price<<endl;
    		break;
    	case 3: cout<<"Enter the length of base1: ";
    		cin>>base1;
    		cout<<"\nEnter the length of bas2: ";
    		cin>>base2;
    		cout<<"\nEnter the height: ";
    		cin>>height;
    		cout<<"\n";
    		price = area_(base1,base2,height);
    		cout<<"The price per square inch is: "<<price<<endl;
    		break;
    	default: cout<<"Not valid choice\n";
    	}
    	return 0;
    }
    		
    	
    
    
    
    
    double area_(double&r)
    {
    	double price, area1, aPrice;
    	cout<<"\nEnter the price in for the pizza you paid: ";
    	cin>>price;
    	cout<<endl;
    	area1 = PI * r * r;
    	aPrice = price / area1;
    	return aPrice;
    }
    double area_(double &h, double &w)
    {
    	double price, area1, aPrice;
    	cout<<"\nEnter the price in for the pizza you paid: ";
    	cin>>price;
    	cout<<endl;
    	area1 = w * h;
    	aPrice = price / area1;
    	return aPrice;
    }
    double area_(double &b1, double &b2, double &h)
    {
    	double price, area1, aPrice;
    	cout<<"\nEnter the price in for the pizza you paid: ";
    	cin>>price;
    	cout<<endl;
    	area1 = (b1+b2) * h * 0.5;
    	aPrice = price / area1;
    	return aPrice;
    }
    int full_screen()
    {
    	keybd_event(VK_MENU,0x38,0,0);
    	keybd_event(VK_RETURN,0x1c,0,0);
    	keybd_event(VK_RETURN,0x1c,KEYEVENTF_KEYUP,0);
    	keybd_event(VK_MENU,0x38,KEYEVENTF_KEYUP,0);
    	return 0;
    }
    int kill_cursor()
    {
    	CONSOLE_CURSOR_INFO cci;
    	cci.dwSize=1;
    	cci.bVisible = FALSE;
    	SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cci);
    	return 0;
    }
    
    void clrscrn()
    {
    	COORD coordScreen={ 0, 0};
    	DWORD cCharsWritten;
    	CONSOLE_SCREEN_BUFFER_INFO csbi;
    	DWORD dwConSize;
    	HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    
    	GetConsoleScreenBufferInfo(hConsole, &csbi);
    	dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
    	FillConsoleOutputCharacter(hConsole,TEXT(' '), dwConSize, coordScreen, &cCharsWritten);
    	GetConsoleScreenBufferInfo(hConsole, &csbi);
    	FillConsoleOutputAttribute(hConsole,csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten);
    	SetConsoleCursorPosition(hConsole, coordScreen);
    }

    Code:
    --------------------Configuration: homework4 - Win32 Debug--------------------
    Compiling...
    main.cpp
    Linking...
    main.obj : error LNK2001: unresolved external symbol "double __cdecl area_(double const &,double const &,double const &)" (?area_@@YANABN00@Z)
    main.obj : error LNK2001: unresolved external symbol "double __cdecl area_(double const &,double const &)" (?area_@@YANABN0@Z)
    main.obj : error LNK2001: unresolved external symbol "double __cdecl area_(double const &)" (?area_@@YANABN@Z)
    Debug/homework4.exe : fatal error LNK1120: 3 unresolved externals
    Error executing link.exe.
    
    homework4.exe - 4 error(s), 0 warning(s)
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  2. #2
    geek SilentStrike's Avatar
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    Code:
    double area_(const double&r);
    double area_(const double&h,const double&w);
    double area_(const double&b1,const double&b2, const double&h);
    The functions are defined as taking const references, while their implementation (really different definition, so it's not their implementation at all, they are not implemented.) aren't using const. See the difference?

    Code:
    double area_(double&r)
    Last edited by SilentStrike; 10-20-2002 at 10:15 PM.
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  3. #3
    Unleashed
    Join Date
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    Besides the above pointing out that your function prototypes and function definitions do not match up, a constant would be:
    const .075
    const "Foo"
    etc.
    The world is waiting. I must leave you now.

  4. #4
    Comment your source code! Lynux-Penguin's Avatar
    Join Date
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    DOH!!!
    Asking the right question is sometimes more important than knowing the answer.
    Please read the FAQ
    C Reference Card (A MUST!)
    Pointers and Memory
    The Essentials
    CString lib

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