John Davidson

Message:

I have to resolve this exercice :
Display all the numbers in descending order between 0 and 100, then display hurray each prime number between 100 and zero within the same loop that displays the decreasing eveners.

I did this code :

for($n=100; $n>0; $n-=1 ){

    $tableaunombrepaires[]= $n;

//loop for dividers

for($j=2; $j<=$n/2; $j++) {

    $diviseurs[]= $j;

}

// here we devide 

    foreach($diviseurs as $diviseur){

        $restes[]=$n%$diviseur;    

    }

    if(!(in_array(0,$restes))){

        echo "$n hourrah! \n";

    } 

    else{

        echo "$n \n";

    }

    

}

but it doesn't work
help please

---

My Answer:
=0; $n--){
if($n % 2 == 0){
echo $n . " ";
}
if(is_prime($n)){
echo "Hurray! " . $n . " is a prime number. ";
}
}

function is_prime($num){
if($num < 2){
return false;
}
for($i=2; $i<=sqrt($num); $i++){
if($num % $i == 0){
return false;
}
}
return true;
}

This code will first display all the even numbers in descending order between 0 and 100, and then display "Hurray!" for each prime number between 100 and 0. The is_prime function is used to check if a number is prime or not.