Learn Java by Example: Java Program to Display Prime Numbers Between Two Intervals

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Java Program to Display Prime Numbers Between Two Intervals

In this program, you’ll learn to display prime numbers between two given intervals, low and high. You’ll learn to do this using a while and a for loop in Java.

 


Example: Display Prime Numbers Between two Intervals


public class Prime{

    public static void main(String[] args){

        int low = 20, high = 50;

        while (low < high) {
            boolean flag = false;

            for(int i = 2; i <= low/2; ++i) {
                // condition for nonprime number
                if(low % i == 0) {
                    flag = true;
                    break;
                }
            }

            if (!flag && low != 0 && low != 1)
                System.out.print(low + " ");

            ++low;
        }
    }
}

Output

23 29 31 37 41 43 47 

In this program, each number between low and high are tested for prime. The inner for loop checks whether the number is prime or not.

 

The difference between checking a single prime number compared to an interval is, you need to reset the value of flag = false on each iteration of while loop.

Note: If you check the interval from 0 to 10. Then, you need to exclude 0 and 1. As 0 and 1 are not prime numbers. The condition will be:


if (!flag && low != 0 && low != 1)

 

 

 

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