Oct 23, 2016 · Your method for finding if your number is prime is the correct method. To make it so that it does not consistently print out whether or not the number is prime, you could have an external variable, which represents whether or not the number is prime. Such as

I am trying to find the fastest way to check whether a given number is prime or not (in Java). Below are several primality testing methods I came up with. Is there any better way than the second

But more importantly, the implementation itself is wrong. The very first test number in the question to test is one. This code recognizes number one as a prime number! As the range will be empty, so none will match. But the same will happen with number zero as it is also recognized by this code as prime, and all the negative numbers as well.

Apr 26, 2018 · for better performance, you can check the number id divide by 2 or not then in for loop start with 3 and increase the i with +2. It will skip all even number so the computation of prime number will faster two time. –

Oct 8, 2014 · Write a method that determines whether a number is prime. Then use this method to write an application that determines and displays all the prime numbers less than 10,000. It seems to me that you need a method that returns true if the number you pass it …

Feb 12, 2019 · First make a method to check if a number is prime boolean isPrime(int i), then make method to reverse the number, int reverse(int i). Create a method boolean isReversePrime(int i) which calls both isPrime(i) and isPrime(reverse(i)) , etc etc. Breaking down a problem into smaller steps may look like more work, but it makes your code much easier ...

Dec 23, 2018 · Problem one, you should be using noneMatch (not anyMatch).Problem two, your range is off. Use rangeClosed (or add one to your end) which should be the square root of n (not just n) - and you started with 2 as an initial value in your first test.

May 4, 2022 · I am writing a very basic program in Java to check if a number given by the user is a prime number. I have tried to use an if statement to check if the number divided by itself is equal to 1 as well as if it is divided by 1 it equals itself, but when I run the program and enter a number there is no reaction at all from the if statement.

May 5, 2018 · Prime number check in Java [closed] Ask Question Asked 6 years, 11 months ago. Modified 3 years, 4 months ago.

May 10, 2015 · Just an improvement to already suggested answers : For testing if a number(n) is prime, you can check if that number is divisible by any number between 2 to SquareRoot(n). No need to test it with all numbers less than n.