maniakes ([info]maniakes) wrote,
@ 2008-04-28 13:17:00
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Fun fact of the day
The following statement is true:
c == c++;

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[info]daedalus4096
2008-04-28 08:36 pm UTC (link)
All hail the postfix operator!

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[info]triss
2008-04-28 11:09 pm UTC (link)
Hail, hail the lucky ones...

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In most cases....
[info]makellan
2008-04-29 03:58 pm UTC (link)
The statement will return false if c started as -1.

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Re: In most cases....
[info]maniakes
2008-04-29 04:42 pm UTC (link)
Why? Isn't -1 equal to -1?

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Re: In most cases....
[info]makellan
2008-04-29 07:57 pm UTC (link)
c = -1;
if(c = c++)
{
printf("this will not be printed");
}
else
{
printf("This will be printed because the 'if' evaluates the result "
"of the assignment to be 0, which is false");
}

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Re: In most cases....
[info]daedalus4096
2008-04-29 08:01 pm UTC (link)
That would be true if he were using an assignment operator, which he's not. The double-equals is the equality operator.

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Re: In most cases....
[info]daedalus4096
2008-04-29 08:02 pm UTC (link)
Heh, I just realized that I could rephrase my above statement as:

== != =

I'm such a nerd.

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Re: In most cases....
[info]daedalus4096
2008-04-29 08:00 pm UTC (link)
It shouldn't. The whole point of the postfix operator is that the increment takes place *after* the statement is resolved. So, in your case, the statement would resolve to (-1 == -1), which would evaluate as true, and afterwards the value of c would be 0.

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Re: In most cases....
[info]makellan
2008-04-29 08:04 pm UTC (link)
Ahh yes, postfix, not prefix. Good point.

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