Nathan Rixham wrote:
Robert Cummings wrote:
Nathan Rixham wrote:
Robert Cummings wrote:
Nathan Rixham wrote:
Robert Cummings wrote:
steve_r wrote:
I'm new to programming
function check_it2($val) {
echo gettype($val);
switch($val) {
case($val > 0 ):
echo "Switch greater than 0";
You're a tad confused :)
Q: What is the result of $val > 0?
A: false.
Q: What is the value of $val?
A: 0
Q: Is 0 equivalent to false?
A: Yes!
Use an if statement for this kind of logic.
This is a fantastic example of false logic and an easy pitfall.
in fact this would make a great interview question!
to expand a little on the various scenarios (just for clarity, Rob is
right)
$val = 1;
1 > 0 equates to TRUE
is 1 equivalent to TRUE : YES
$val = 0;
0 > 0 equates to FALSE
is 0 equivalent to FALSE : YES
$val = -1;
-1 > 0 equates to FALSE
is -1 equivalent to FALSE: YES
so no matter what value you set $val to; it's always true.
Fail on that last one. -1 is not equivalent to FALSE :B
well that's one job I'm not getting :p
Well you DID get 66.7%. I've met "coders" that would stare at the answer
and still not understand :D
the travesty is that I spent most of yesterday on trains brushing up on
/ studying formal logic!
Muphry's Law!!!
http://en.wikipedia.org/wiki/Muphry's_law
*heheh*
Cheers,
Rob.
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