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What is a Prime Number?
A Prime Number is a number that is only divisible by one or itself. It is a natural number greater than one that is not a product of two smaller natural numbers. For example, 11 is only divisible by one or itself. Other Prime numbers 2, 3, 5, 7, 11, 13, 17, etc.
Note: 0 and 1 are not prime numbers. 2 is the only even prime number.
How to Print Prime Numbers Between 1 to 100 Program in JavaBelow is the Java program to print prime numbers from 1 to 100:
Program Logic:
The main method of prime number program in Java contains a loop to check prime numbers between 1 to 100 in Java one by one.
The main method calls the method CheckPrime to determine whether a number is prime number in Java or not.
We need to divide an input number, say 17 from values 2 to 17 and check the remainder. If the remainder is 0 number is not prime.
No number is divisible by more than half of itself. So, we need to loop through just numberToCheck/2. If the input is 17, half is 8.5, and the loop will iterate through values 2 to 8
If numberToCheck is entirely divisible by another number, we return false, and loop is broken.
If numberToCheck is prime, we return true.
In the main method for prime numbers 1 to 100 in Java, check isPrime is TRUE and add to primeNumbersFound String
Lastly, print prime numbers from 1 to 100 in Java
public class primeNumbersFoundber { public static void main(String[] args) { int i; int num = 0; int maxCheck = 100; boolean isPrime = true; String primeNumbersFound = ""; for (i = 2; i <= maxCheck; i++) { isPrime = CheckPrime(i); if (isPrime) { primeNumbersFound = primeNumbersFound + i + " "; } } System.out.println("Prime numbers from 1 to " + maxCheck + " are:"); 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 == 0) { return false; } } return true; } } Expected Output:
The output of the prime number between 1 to 100 in Java program will be:
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 97Check our program to Find Prime Numbers from Any Input Number
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