Thread: Hi everybody i have a little test and i need to ask something

So i have this code ("this is the correct form")

public static String buildPrimeNumbers(int num){
		String sum="";int j=num;
		for (int i=2;i<=(j/2);i++){
			while (num%i==0) {sum+=i+" ";
			num=num/i;}
		}
	return sum;}

and i have this one("this is what i did ,its look almost exectly like the first one exept i didnt install int j")

public static String buildPrimeNumbers(int num){
		String sum="";
		for (int i=2;i<=(num/2);i++){
			while (num%i==0) {sum+=i+" ";
			num=num/i;}
		}
	return sum;}

my question is my is my code doesn't give me the exact prime numbers as the correct one.
what is the matter between if i put (i<=(num/2)) or (i<=j/2) .while j==num?

Great thanks alot