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Prime Number Java


Prime Number Java

By : tsakane ofentse
Date : November 21 2020, 09:01 AM
I wish this help you It seems to me that you need to reset isPrime to true inside the loop, at the moment you only set it once, not for each iterator across the numbers.
As a result your test for prime numbers fails after it find the first composite number (4).
code :


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Prime number checker using Java

Prime number checker using Java


By : Pawan Sharma
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Your problem is int overflow. 2147483647 is the maximum value for int. This data type can't store larger numbers.
Double should be used for floating numbers.
code :
BigInteger a = new BigInteger("1024"); // creates BigInteger representing number 1024.
BigInteger b = new BigInteger(1024); //also creates BigInteger representing number 1024.
BigInteger c = new BigInteger("10000000000", 2); //also creates BigInteger representing 1024
if (a.equals(b)) {...}
 BigInteger c = a.add(b);
 //or
 a = a.add(b);
Prime number in java 8

Prime number in java 8


By : user6933210
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , IntStream can be used to generate integer stream
code :
public static boolean isPrime(int number) {
    return !IntStream.rangeClosed(2, number/2).anyMatch(i -> number%i == 0); 
}
public static boolean isPrime(int number) {
    return IntStream.rangeClosed(2, number/2).noneMatch(i -> number%i == 0);
}
My code works fine but every time the input is a prime number it keeps on printing "This is a prime number." o

My code works fine but every time the input is a prime number it keeps on printing "This is a prime number." o


By : KamehK
Date : March 29 2020, 07:55 AM
should help you out Your code has some issues. To start with, you're never updating a, so you only ever check if the number n is even.
Once you fix that, you have two indentation problems. The first is that the break line needs to be inside the body of the if statement. Indent it more so that it's inside the if block.
code :
while n > a:
    if ((n % a) == 0) & (a != n):
        print('Sorry, the number you have entered is not prime.')
        break                                # indent this line more!
    a += 1                          # increment a, so you don't keep checking 2 over and over
else:                                        # unindent this line (and the next line too)
    print('The number you have entered is indeed prime!')
Generating relative Prime number of a user defined prime number?

Generating relative Prime number of a user defined prime number?


By : Rajesh A
Date : March 29 2020, 07:55 AM
With these it helps If you want to find the next smallest relative prime, then I think you need to loop from the user's inputted number (e.g. if users input 3, then you need to loop from 4), and then check whether that number is relatively prime.
To check whether two numbers are relatively prime, you can use gcd, and one very famous algorithm to do this is to use Euclid's algorithm. You don't need to include a specific library, it's basically just looping and doing modulo. Take a look at this link.
Prime Number in java

Prime Number in java


By : Aaron Paul
Date : March 29 2020, 07:55 AM
will be helpful for those in need Have a look at: https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
This is quite a nice way of doing it.
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