CODEWITHSUNDEEP
php
user4212177
user4212177

Reputation:

For loop not changing value

I need to subtract 10 from a value until it's below ten and then use it outside of the loop but the value doesn't seem to change. I'm not sure how many wrongs I'm making but I bet it's many!

$x = 1987;
$y = 2015;
$b = $y - $x;
for($b; $b > 10; $b - 10){
    echo $b; //This is supposed to be echo:ed when the loop is done
}

Thanks in advance!

Upvotes: 0

Views: 65

Answers (5)

dev0
dev0

Reputation: 1057

A while loop is more readable than a for loop. Also, put the echo statement after the loop has completed.

$x = 1987;
$y = 2015;
$b = $y - $x;
while($b > 10) {
    $b -= 10;
}
echo $b;

Upvotes: 0

rpkamp
rpkamp

Reputation: 811

Or you could just do

$x = 1987;
$y = 2015;
$b = ($y - $x) % 10;

Which is basically what you're doing, only you chose the hard way with the for loop :)

Upvotes: 1

Subin Thomas
Subin Thomas

Reputation: 1416

$x = 1987;
$y = 2015;
$b = $y - $x;
for(; $b > 10; $b -= 10);
echo $b;

echo will happen only after completing loop. This will reduce the $b value by multiples of 10. $b will be less than 10 after loop.

Upvotes: 0

Gio Plenzik
Gio Plenzik

Reputation: 56

$x = 1987;
$y = 2015;
$b = $y - $x;
for($b; $b > 10; $b -= 10) { 
    echo $b; 
}

Upvotes: 0

rawb
rawb

Reputation: 2426

You are not actually modifying $b:

$x = 1987;
$y = 2015;
$b = $y - $x;
for($b; $b > 10; $b = $b - 10) { // <- this line
    echo $b;
}

Also, there is no need for the initial $b here:

for(; $b > 10; $b = $b - 10) {

Or you could get rid of:

$b = $y - $x;

And just use:

for($b = $y - $x; $b > 10; $b = $b - 10) {

Upvotes: 2

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