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Re: Starting a for loop within an if loop [message #57638 is a reply to message #57637]

Thu, 20 December 2007 02:08

Wox
Messages: 184
Registered: August 2006

Senior Member

On Wed, 19 Dec 2007 19:57:50 -0800 (PST), Mat Smith
<mat.smith@port.ac.uk> wrote:

> IF keyword_set(mc) THEN BEGIN
> FOR i=0,n-1 DO BEGIN
> t=d[i]
> ENDIF
>
> and later in the program
>
> IF keyword_set(mc) THEN BEGIN
> ENDFOR
> ENDIF

You're thinking of preprocessor directives like in e.g. C++

#ifdef <token>
/* code */
#endif

So at compile time it looks whether <token> is defined or not and
includes or excludes code in compilation. Even if IDL would be
compiled and have a preprocessor, you only know whether <token> is
defined ("keyword is set" if you will) at runtime.

Btw, it's an "if statement" not an "if loop". I don't want to offend
you, but I was glad someone told me that ones. Time to return the
favour ;-).

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[Message index]

		Re: Starting a for loop within an if loop By: edward.s.meinel@aero. on Thu, 20 December 2007 07:01
		Re: Starting a for loop within an if loop By: David Fanning on Thu, 20 December 2007 05:43
		Re: Starting a for loop within an if loop By: Carsten Lechte on Thu, 20 December 2007 03:19
		Re: Starting a for loop within an if loop By: Wox on Thu, 20 December 2007 02:08
		Re: Starting a for loop within an if loop By: Allan Whiteford on Thu, 20 December 2007 01:31
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:50
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:15
		Re: Starting a for loop within an if loop By: Mat Smith on Wed, 19 December 2007 22:15
		Re: Starting a for loop within an if loop By: David Fanning on Wed, 19 December 2007 20:14
		Re: Starting a for loop within an if loop By: Carsten Lechte on Fri, 21 December 2007 02:12

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