24号是偶数还是奇数？

I am working on my test case for checking if number is odd or even and when I number is 3 then it shows Odd number but number is 24 then it still shows number as Odd number.

I am using modules Divide for checking the Odd Even number. Please have a Look at the code and let me know where I am making mistake:

<?php



$stdin = fopen("php://stdin", "r");

fscanf($stdin, "%d
", $N);

fclose($stdin);

if($stdin / 2 != 0){

print("Weird");
}
else{

    if(($stdin >= 2) && ($stdin <= 5)){
        print("Not Weird");
    }
    elseif(($stdin >= 6) && ($stdin <= 20)){
        print("Weird");
    }
    elseif($stdin > 20){
        print("Not Weird");
    }
}

use module operator % instead of division

https://www.php.net/manual/en/internals2.opcodes.mod.php

24 / 2 = 12 So it will not be 0

24 % 2 = 0 since it calculates remainder ( what is left over when division has been done equally )

23 % 2 = 1 (since after dividing equally we will have 1 left