Would it not just be easier to randomise 3 numbers, place them in an array, sort the array and echo them out?
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if() question
In college, the teacher send me a php homework.
rand three numbers, and list all numbers from the highest sorted to the lowest sortted.
i done with 2, but no with three.
$a=rand(1,100);
$b=rand(1,100);
if($a>$b) {
while($a>$b) {
printf("$a<br>");
$a--;
} }
else if($b>$a) {
while($b>$a) {
printf("$b<br>");
$b--;
} }
but i cant do with three, cause the 'if' doesnt work with for exemple: if($a>$b>$c)
why the if() dowsnt work with thress comparasions?
tx.
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Answers
The code block for the if statement of:
if($a>$b || $b>$c)
Would execute if $a is greater than $b and/or $b is greater than $c. Since either individual expression could be true and it will enter the if statement code block, I don't think you gather any valuable information from that if statement structure.
As elpasi eluded to, there may be easier ways to accomplish this depending on the assignment, so you may want to look into array sorting.
>> i can do
if($a>$b || $b>$c) ??????????? <<
That is a valid if statement. You will still need to do work to get your homework answer but the if above will work in PHP. That is the correct method to use when you want if to look at 2 conditions. Each one needs to be able to stand on its own (e.g. "if ($a>$b)" and "if ($b>$c)") and then you provide the operator to show the relationship (in the example above you used or).
I hope this helps clear up the principle (without breaking any rules). :) Good luck on the assignment.
bol
You can learn more about the logical operators here:
http://us.php.net/manual/e
I'm glad I could help. I'm a little surprised you didn't choose to split this with other experts too. Let me know if you meant to do that and want to correct it. Otherwise you might want to post a comment to explain why you closed it the way you did. It seems to me that others helped with this too. :)
Thanks for the grade, the points and the fun question.
bol
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by: MacAnthonyPosted on 2007-09-18 at 09:29:48ID: 19914381
Because $a>$b>$c isn't a valid expression and the if statement takes an expression (something that evaluates to true or false). The expression $a > $b > $c does not evaluate correctly as strictly true or false in php.
http://us.php.net/manual/e
I won't do your homework for you, but I will be more than help you try and understand the assignment.