Problems With The For Routine Options

[pnegrini]

Hi all,

I tried to used a simple routine look like:

for (i=0;i==10;1++) and it works ok.
But When I tried to used a
for (i=64;i==100;1++) the progrmam, when in debbuger mode just jump it.
Any one know what's the problem?
Some times the " for(i=10;i==20;i) don´t work fine. When I replace the "==" to "<" the progrma work very well !!

Any one??

[Orin]

Hi all,

I tried to used a simple routine look like:

for (i=0;i==10;1++) and it works ok.
But When I tried to used a
for (i=64;i==100;1++) the progrmam, when in debbuger mode just jump it.
Any one know what's the problem?
Some times the " for(i=10;i==20;i) don´t work fine. When I replace the "==" to "<" the progrma work very well !!

Any one??

As has been pointed out, you should have i != 100 and i++. But in general, it's said to be safer to use "<" than "!=" in such a loop as it can prevent infinite loops if the "i" gets changed somewhere else in the loop.

If you KNOW that the loop is going to be executed at least once, you are better off using the following:

i = 0;
do { /* loop contents */ } while ( ++i != 10 );

Or if "i" is ONLY used as a counter, the following can be better still:

i = 10;
do { /* loop contents */ } while ( --i != 0 );

Both can produce shorter, faster code!

Orin.