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while loop

 
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while loop, "->"
raedbenz
2 Jul, 2008 - 09:42 PM
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HI,,
i have seen some prgorams use in the while loop this condition "->" , instead of "=>" .
what "->" does mean?
thanks
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no2pencil
RE: While Loop
2 Jul, 2008 - 09:50 PM
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I don't think that I've ever seen that used. Can you post an example?

I'm pretty sure, feel free to correct me, but you can't use a minus sign in the conditional. It's either greater than, less than, or equal to. The only combination being the equal to can be combined with either of the less than or greater than.
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Einherjar
RE: While Loop
2 Jul, 2008 - 09:53 PM
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My guess is that they are checking some member function of a pointer in the conditional of the while loop. If that makes sense... In other words:
CODE

while(somepointer->getValue())


This post has been edited by Einherjar: 2 Jul, 2008 - 09:53 PM
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tortillaboy05
RE: While Loop
2 Jul, 2008 - 10:15 PM
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Yeah thats what I was thinking too. Its all the -> operator is used for as far as I know.
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gabehabe
RE: While Loop
3 Jul, 2008 - 01:39 AM
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It's used when you create a class pointer.

So, say you have a class SomeClass it would be created like:
SomeClass *p;

Then, instead of using . you would use -> like:
p->SomeFunction();

Another example is the this-> pointer, used in function definitions from within a class.

Hope this helps smile.gif

This post has been edited by gabehabe: 3 Jul, 2008 - 01:41 AM
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kapax
RE: While Loop
3 Jul, 2008 - 06:30 AM
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Excuse me, but what is => ?

Is it the same as >= ?
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Einherjar
RE: While Loop
3 Jul, 2008 - 11:37 AM
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QUOTE(kapax @ 3 Jul, 2008 - 10:30 AM) *

Excuse me, but what is => ?

Is it the same as >= ?


Well in C++ => doesn't exist, but it does in Ruby smile.gif
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polymath
RE: While Loop
3 Jul, 2008 - 12:42 PM
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Well, the -> operator is also used for structures in C/C++.

Example:
cpp

struct thisStruct{
   bool value;
   int trash;
}

thisStruct * Object;
while (Object->value==true); // OR just while (Object->value);
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ibaraku
RE: While Loop
3 Jul, 2008 - 12:52 PM
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You could also like at it like so:
Let's say you have a struct or class called Record.
CODE

Record *p;
p = new Record;
p->grade = 'A';


The notation p->grade is the same as (*p).grade
sometimes seeing that helps understand what the arrow operator means
hope that helps
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