Optional Arguments

Code:

---

// Header file:
void GetInput(string ErrMsg = "");

//Source file:
void GetInput(string ErrMsg = "")
{
        int iTempX = 0;
        int iTempY = 0;

        char cTempX = 'A';

        cout<<"Please enter the x-coord: ";
        cin>>cTempX;
       
        iTempX = cTempX - 'A';

        cout<<"Please enter the y-coord: ";
        cin>>iTempY;

        iTempY--;       
}

---

I get the error "GetInput' : redefinition of default parameter : parameter 1".

If my memory serves me correctly (which it probably doesn't), then you can only initialise default parameters in the definition. Try losing the default parameter from the (C++) declaration.

If I change the function prototype to 'void GetInput(string ErrMsg)', then when I call it using 'GetInput();', I get the following error message: 'error C2660: 'GetInput' : function does not take 0 parameters'

Then you haven't given it a default parameter.

This works -

Code:

---

#include <iostream>

using namespace std;

// Header file:
void GetInput(string ErrMsg);

//Source file:
void GetInput(string ErrMsg = "")
{
        int iTempX = 0;
        int iTempY = 0;

        char cTempX = 'A';

        cout<<"Please enter the x-coord: ";
        cin>>cTempX;
       
        iTempX = cTempX - 'A';

        cout<<"Please enter the y-coord: ";
        cin>>iTempY;

        iTempY--;       
}


int main()
{
        GetInput();
        return 0;
}

---

That works IF they are in the same file. But if the prototype is in "theheader.h", the code is in "theheader.cpp", and int main() is in "main.cpp", it doesn't work.

Drop the default parameter in the source file fn definition - only have the default in the header file fn declaration.

(BTW, given that it looks like you've tried just about every other permutation, I would imagine you've already arrived at this conclusion. ;) ).

Actually, I hadn't tried that. :D

It works now. Thanks.