Printing prime number from 1 to 100

Question

This program is supposed to output the prime numbers between 1 and 100. Will anyone please explain me the flow the programme below? I am having difficulty in writing the progra

Answer 1

The number which is only divisible by itself and 1 is known as prime number. Here is the simplest version of the code for finding prime numbers between 1 to 100.

import java.io.*;
import java.util.*;
class solution
{
    public static void main(String args[])
    {
        Scanner scan = new Scanner(System.in);
        int n = 100;
        /*
            A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself.
        */
        for(int i=2;i<=n;i++) // 1.So we are starting with initialization i = 2
        {
            int flag = 1;
            for(int j=2;j<=i/2;j++)  // 2.Try dividing the number by half check whether it divisible
            {
                if(i%j==0) // 3. If the number is divisible by other number ->Not a prime Number
                {
                    flag = 0;
                    break;
                }

            }
            if(flag==1) // 4. If the number is not divisible by any other numbers but only by itself and 1 -> prime no
            {
                System.out.print(i+" ");
            }
        }
    }
}
/*
    Output:
    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
*/