Question

I have created this code and I received a comment that says:

“The for loop in the countPrimes method does not count from 0 to the
entered value”.

I don’t understand, can you tell me what does this comment mean?

private static boolean isPrime(int prime) {
    if (prime <1 || prime % 2 == 0){
        return false;
    }

    for(int i = 2; i <= Math.sqrt(prime) ; i++) {
        if ((prime % i) == 0) {
            return false;
        }
    }
    return true;
}


/**
 * Count howmany prime exsit between user input and 10,000.
 * @param test if the number is prime.
 * @return the number of primes are found.
 */
private static int countPrimes(int userInput){
    int count =0;
        for(int i=userInput; i<=MAX_PRIME; i++) {
            if(isPrime(i)){
                count++;
            }
        }
    return count;   
    }

Answer 1

It means that it doesn’t do this:

for(int i=0; i<=userInput; i++)

And that’s all there is to say about it, really. You should have asked the person who made the commment, IMO.