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A prime number is a number that is only divisible by 1 or itself. For example, 11 is only divisible by 1 or itself. Other Prime numbers 2, 3, 5, 7, 11, 13, 17....
Note: 0 and 1 are not prime numbers. 2 is the only even prime number.
CheckPrime
to determine whether a number is primenumberToCheck
is entirely divisible by another number, we return false, and loop is broken.numberToCheck
is prime, we return true.TRUE
and add to primeNumbersFound String public class primeNumbersFoundber { public static void main(String[] args) { int i; int num = 0; int maxCheck = 100; // maxCheck limit till which you want to find prime numbers boolean isPrime = true; //Empty String String primeNumbersFound = ""; //Start loop 1 to maxCheck for (i = 1; i <= maxCheck; i++) { isPrime = CheckPrime(i); if (isPrime) { primeNumbersFound = primeNumbersFound + i + " "; } } System.out.println("Prime numbers from 1 to " + maxCheck + " are:"); // Print prime numbers from 1 to maxCheck System.out.println(primeNumbersFound); } public static boolean CheckPrime(int numberToCheck) { int remainder; for (int i = 2; i <= numberToCheck / 2; i++) { remainder = numberToCheck % i; //if remainder is 0 than numberToCheckber is not prime and break loop. Elese continue loop if (remainder == 0) { return false; } } return true; } }
Prime numbers from 1 to 100 are: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Check our program to Find Prime Numbers from Any Input Number
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