I'm a beginner learning PHP. I have tried to make a loop that has a different behaviour for both even and odd numbers. I've been playing around with it for a while, yet I still can't get it to work. Has anyone got a solution?
$count = 0;
$mod = $count % 2;
while ($count < 10)
{
if ($mod == 0) {
echo "even, ";
} else {
echo "odd, ";
}
$count++;
}
A silly mistake, mod inside while() loop.
$count = 0;
while ($count < 10) {
$mod = $count % 2; //Here
if ($mod == 0) {
echo "even, ";
} else {
echo "odd, ";
}
$count++;
}
$count = 0;
$mod = $count %2;
Is were your problem is.
You have to use the modulus (%) operator inside the for loop. Also, there is no need to store the value from the use of the modulus operator at all, it can be compared directly inside the for-loop.
for ($count = 0; $count < 10, $count++) {
if ($count % 2 == 0) {
echo "even, ";
} else {
echo "odd, ";
}
}
You can also switch the while to a for like this.
Welcome to PHP.
Edit #1:
As you are getting a new value of $count every execution of the for-loop the old value if $count % 2 will be incorrect. It has to recalculate for every $count. First it checks if 0 is divisible by 2, then onto 1 and so forth. For every value of $count you have to check the divisibility.
In most programming languages you aren't computing a variable onto another, instead you are taking the value of the variable. Like $a = $b + $c; in that case, if you change the value of $b or $c it does not automatically update $a. Instead you have to call $a = $b + $c again. It is the same with % operator.
int a = b + c; then later add to c it will not automatically update a. Instead you have to again write a = b + c; A bit off-topic, what you want to do is possible n some languages. Were you can work with references were it is possible. $count = 0;
while ($count < 10) {
$mod = $count % 2;
if ($mod == 0) {
echo "even, ";
} else {
echo "odd, ";
}
$count++;
}
use for loop instead of while loop
for($count=0;$count<10;$count++)
{
if(($count % 2) == 0)
echo "even,";
else
echo "odd,";
}
$mod = $count % 2;inside thewhileloop. :)