Re: variable length function

[Ron Michael Khu <ronkhu@ntsp.nec.co.jp>]

Mr Ankit Jain,

u can verify all these "main return value" ambiguity
by making a simple script file that would print the return value
of the last app executed. In bash u could simply use "echo $?" on the 
command line.

So in dos mode, Perhaps u could make use of  "echo %errorlevel%" on the 
dos prompt

with these simple shell commands, u will then be able to see for urself 
if a
void-valued main would implicity return an int or not...

-ron


Steve Graegert wrote:

>On 6/15/05, Ankit Jain <ankitjain1580@yahoo.com> wrote:
>  
>
>>hi
>>    
>>
>
>[snip]
>
>  
>
>>if i write the same module in it then it takes void as
>>the default return type...........?
>>    
>>
>
>No it does not.  When specifying no return type int is returned
>implicitly.  Under Windows, even if main is void-valued, the exit
>code, whatever value it may have, is converted to int.
>
>  
>
>>--- Glynn Clements <glynn@gclements.plus.com> wrote:
>>
>>    
>>
>>>Ankit Jain wrote:
>>>
>>>      
>>>
>>>>Well then i am just trying to clear my concept
>>>>        
>>>>
>>>again.
>>>      
>>>
>>>>main()
>>>>{
>>>>
>>>>         printf("This is main");
>>>>
>>>>}
>>>>
>>>>now this simple function main according to this
>>>>discussion will return a int value.......Am i
>>>>right....
>>>>        
>>>>
>>>Correct.
>>>
>>>      
>>>
>>>>but is it true with any compiler?
>>>>        
>>>>
>>>It's true for any compiler which supports pre-ANSI C
>>>(aka "K&R C").
>>>ANSI C requires the return type to be specified.
>>>
>>>      
>>>
>>>>another thing........... if it returns a int value
>>>>        
>>>>
>>>and
>>>      
>>>
>>>>we have not returned any value
>>>>        
>>>>
>>>explicitly.........then
>>>      
>>>
>>>>what is the value returned ....as far as i know
>>>>        
>>>>
>>>its a
>>>      
>>>
>>>>non-zero value. but then what will that mean.....?
>>>>        
>>>>
>>>It's an unspecified value. It could be any "int"
>>>value, including
>>>zero. As there is only one zero but many more
>>>non-zero values, it
>>>probably won't be zero, but it isn't guaranteed.
>>>
>>>Hopefully the compiler will issue a warning in this
>>>situation.
>>>
>>>--
>>>Glynn Clements <glynn@gclements.plus.com>
>>>
>>>      
>>>
>-
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>  
>