Print Prime Numbers from 1 to 100 in Java

Print Prime Numbers from 1 to 100 in Java | Prime numbers are natural numbers that are divisible by only 1 and the number itself. In other words, prime numbers are positive integers greater than 1 with exactly two factors, 1 and the number itself. Also see:- Prime Number Program in Java

For example- 5 is a prime number because it has only two factors 1 and 5.

Similarly,
8 is not a prime number because it has more than 2 factors that are 1, 2, 4, and 8.

Note:- All negative numbers, 0 and 1 are not the prime numbers.

Print Prime Numbers from 1 to 100 in Java

In this program, we will use the For Loop to print prime numbers from 1 to 100.

Program description:- Write a program to print prime numbers from 1 to 100 in java

public class PrimeNumberInRange {

  public static boolean isPrime(int number) {

    /* Negative numbers, 0 and 1 
     * are not a prime number
     * 
     * Even numbers (except 2) are
     * also not a prime number
     */
     if(number == 2) return true;
     else if(number<=1 || number%2==0)
         return false;

     // logic for remaining numbers
     for(int i=3; i<=Math.sqrt(number); i++) {
         if(number%i == 0) return false;
     }

     return true;
  }

  public static void main(String[] args) {

     // check in range
     System.out.println("Prime numbers from 1 to 100 are:");
     for(int i = 1; i<= 100; i++)
        if(isPrime(i)) 
           System.out.print( i + " ");
  }
}

Output:-

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

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