public int next() { for (int i=lowerRange; iupper) { break; } if (isPrime(i)==true) { lowerRange=i+1; return i; } } return 0; } For some reason this is giving me the prime numbers up until the "upper"-th prime number, instead of all the prime numbers until the VALUE OF upper. Any ideas??

Question

public int next() {
		for (int i=lowerRange; i<=upper; i++)
		{
			if (lowerRange>upper)
			{
				break;
			}
			
			if (isPrime(i)==true)
			{	
				lowerRange=i+1;
				return i;
			}
		}
		return 0;
	}
For some reason this is giving me the prime numbers up until the "upper"-th prime number, instead of all the prime numbers until the VALUE OF upper. Any ideas??

rsmith6559 · Answer

I think you've stumbled onto an oddity of variable scoping.  i inside the braces is one thing, i in the for loop is another.  Just for fun, put a print statement in the second if block and see what happens on a short run.

anonymous · Answer

I didn't get what do you want to archive with this function. Is your objective to list all prime number from a number X to a number Y?