Re: [C++ Question] For loop Multiple Initialization

From:

Pete Becker <pete@versatilecoding.com>

Newsgroups:

comp.lang.c++

Date:

Tue, 4 Nov 2008 05:20:37 -0500

Message-ID:

<2008110405203716807-pete@versatilecodingcom>

On 2008-11-03 23:03:16 -0500, blargg.h4g@gishpuppy.com (blargg) said:

Pawel Dziepak wrote:

charlie.xia.fdu@gmail.com wrote:

for(int i=0,int j=10 ; i<5&&j<10 ; i++ , j--) {}

example from: http://www.tech-faq.com/iterations.shtml
Is not valid in my eclipse cdt.
Is there multiple initialization in C++? How can we use that?

That way is correct:

for (int i=0, j=10; i<5 && j<10; i++, j--) {}

Unless I'm wrong, there's no way to initialize variables of different
types in that part of for loop.

I'll probably regret this, but I believe you can:

    double d;
    int* p;
    for ( char c = (d = 1.234, p = new int, 'X'); ...

Or, less cryptically,

double d;
int *p;
char c;
for (c = 'X', d = 1.234, p = new int; ...

Now, technically, that's not initialization, but it may well be what
was actually meant.

--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)