Longs are read a Ints

[nhmllr]

So I'm working through project euler, and problem 4 calls for a big number. It's outside of int territory, but inside of long territory. So I declare it as a long, yet it errors because it's too big for an int

"The literal 600851475143 of type int is out of range "

If anyone's curious, here's the code

//Find the largest prime factor of a composite number (600851475143).

public class problem3 {
	
	//main
	public static void main(String[] args) 
    {
		long num = 600851475143;

		for(double i = 2; i < num+1; i += 1)
		{
			if(num%i == 0)
			{
				System.out.println(i);
				num /= i;
				i -= 1;
			}
		}
    }
}

[Solarsonic]

Change

for(double i = 2; i < num+1; i += 1)

to

for(long i = 2; i < num+1; i += 1)"

EDIT: Read post #6.

[nhmllr]

Whoops I meant for i to be an int (but I forgot to change it back after some experimenting)

In anycase, I changed it to "for(long i = 2; i < num+1; i += 1)" and it still errors the same way.

It's erroring at the declaration of "num", not on "i."

[Solarsonic]

Whoops I meant for i to be an int (but I forgot to change it back after some experimenting)

In anycase, I changed it to "for(long i = 2; i < num+1; i += 1)" and it still errors the same way.

It's erroring at the declaration of "num", not on "i."

What line is giving you the error?

[nhmllr]

Line 8, "long num = 600851475143;"

I'm using Eclipse, by the way

[Solarsonic]

Line 8, "long num = 600851475143;"

I'm using Eclipse, by the way

In order to use a long that's larger than the maximum value of an int, you need to make it a literal.

Change

long num = 600851475143;

to

long num = 600851475143L;

[nhmllr]

Huh. I've never seen that.
In anycase, I put in that little "L" and I got the problem right!

Thanks a lot!