[SOLVED] Even and uneven numbers

[JJohnsenDK]

Hey

 

Is it possible to declair even and uneven numbers in php?

 

example:

 

if($i != even number){

  echo "";

}

 

And by even and uneven number i mean, that 1, 3, 5, 7 and so on is uneven and 2, 4, 6, 8 and so on is even.

[revraz]

If you can divide it by 2, it's even

[chigley]

<?php

function is_even($no) {
if(is_int($no / 2)) {
  return true;
} else {
  return false;
}
}

if(is_even(25)) {
echo "Even!";
} else {
echo "Odd!";
}

// Output: 'Odd!'

?>

 

Untested, and off the top of my head. I hope it works

[Barand]

use % operator to check the remainder when dividing by 2

<?php
for ($i=1; $i <=10; $i++) echo $i, ' ', ($i % 2 == 0) ? 'Even' : 'Odd', '<br/>';
?>

[chigley]

A learning point for me here. What's it called with all this ? : stuff? I think it begins with a T? Need to read up on it

[emehrkay]

you dont need a function for this. use the modulus operator %

 

if($number % 2){

//odd number

}

 

modulus gives you the remainder.

[Barand]

A learning point for me here. What's it called with all this ? : stuff? I think it begins with a T? Need to read up on it

 

Ternary operator

 

value = condition ? value if condition true : value if condition false

[JJohnsenDK]

wow... many solutions ... thanks for all the answers

[helraizer]

As has been said, this:

 

<?php



for ($i = 0;$i <= 30; $i++) {
if($i % 2) {
echo "$i is an odd number <br>";
} else {
echo "$i is an even number <br>";
}
}
?>

 

will echo

 

0 is an even number
1 is an odd number
2 is an even number
3 is an odd number
4 is an even number
5 is an odd number
6 is an even number
7 is an odd number
8 is an even number
9 is an odd number
10 is an even number
11 is an odd number
12 is an even number
13 is an odd number
14 is an even number
15 is an odd number
16 is an even number
17 is an odd number
18 is an even number
19 is an odd number
20 is an even number
21 is an odd number
22 is an even number
23 is an odd number
24 is an even number
25 is an odd number
26 is an even number
27 is an odd number
28 is an even number
29 is an odd number
30 is an even number

 

Sam