[functions] - opcionals parameters

i know that in C\C++ we can create opcionals parameters, like the printf() function:
printf(char *string, ...); // i have seen these header in stdio.h
how can i do that?
i need build 1 function that accpet several string parameters, but i don't know work with them:(
any advices?

You do it just like that. It's not like optional parameters in VB or C# but more like a ParamArray, i.e. it specifies that the method will accept zero, one or more arguments. You can't specify the number and type of the parameters that way.

Quote:

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Originally Posted by jmcilhinney

You do it just like that. It's not like optional parameters in VB or C# but more like a ParamArray, i.e. it specifies that the method will accept zero, one or more arguments. You can't specify the number and type of the parameters that way.

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i can do with va_list. but i don't understand how can i show the strings:(

Code:

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#include <stdio.h>
#include <conio.h>
#include <stdarg.h>

int Menu( char *sentence, ... )
{
        va_list listPointer;
        va_start( listPointer, sentence );
       
    for( int i = 0 ; i < numargs; i++ )
    {
        char *arg = va_arg(listPointer, char );
        printf( "%s", i, arg );       
    }
        va_end( listPointer );

        return 0;
}


void main()
{
        Menu("hello", "hi", "back", "Down");
        getch();
}

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the 'for' isn't correct but what i read was for 'int' and not 'char' - string's :(

This is a worthwhile read:

http://www.informit.com/guides/conte...lus&seqNum=138

It also mentions default arguments as an alternative, so that's basically optional parameters.

Quote:

---

Originally Posted by jmcilhinney

This is a worthwhile read:

http://www.informit.com/guides/conte...lus&seqNum=138

It also mentions default arguments as an alternative, so that's basically optional parameters.

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thanks