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multiple expression in a single For Statement

 
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multiple expression in a single For Statement
PostPosted: Wed May 26, 2004 7:31 pm     Reply with quote
hi,

anyone in the community who can provide a sample snippet of a multiple expression for statement?

I'll appreciate any help.

Thank u.
future



Joined: 14 May 2004
Posts: 330

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PostPosted: Wed May 26, 2004 8:34 pm     Reply with quote
int8 var;
int8 var1;
int8 var2;

for(var=0;var<255;var++) {
var1++;
var2++;
var1+=var2;
};

Is it all?
Radix
Guest
PostPosted: Thu May 27, 2004 5:48 am     Reply with quote
init-expression and loop-expression can contain multiple statements separated by the comma operator. For example:

Code:

// for_statment3.cpp
#include <stdio.h>
int main()
{
   int i, j;
   for ( i = 5, j = 10 ; i + j < 20; i++, j++ )
      printf( "\n i + j = %d", (i + j) );
}


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_the_c.2b2b_.for_statement.asp

Regards
Ttelmah
Guest
PostPosted: Thu May 27, 2004 6:57 am     Reply with quote
Radix wrote:
init-expression and loop-expression can contain multiple statements separated by the comma operator. For example:

Code:

// for_statment3.cpp
#include <stdio.h>
int main()
{
   int i, j;
   for ( i = 5, j = 10 ; i + j < 20; i++, j++ )
      printf( "\n i + j = %d", (i + j) );
}


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_the_c.2b2b_.for_statement.asp

Regards

This is true for just about any 'statement'. Also, if you put a bracket round the statement group, it is the last element that is returned. So you can say (for instance)
for (i=(buff[0]=fred, buff[2]),....)

and here buff[0] will be set to the value of 'fred', while i will be set to buff[2]. This is particularly useful for generating multi-line '#define' statements, where (for instance), you can define a function to get a character from a circular buffer, like:
int8 btemp;
#define frombuff(buff,in,out,size) (btemp=out,\
out=(++out) % size, \
buff[btemp])

C is very powerful in this regard, but it can lead to very difficult to read code, and if the compiler optimisations are working properly, does not help to reduce the size of code...
Use with care.

Best Wishes
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Thu May 27, 2004 4:59 pm     Reply with quote
True. Once I saw some dude's code which solved the 8 queens puzzle in only one 'for' statement (and it wasn't that long either). Pure genius, but almost impossible to understand.

I wouldn't recommend doing any complicated multi-statements in CCS, as it is asking for trouble. The main rule in using CCS compiler is: stay simple.
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