Need Simple, Basic, Fundamental introductory beggining skills used. [Book:starti

Question

Need Simple, Basic, Fundamental introductory beggining skills used.

[Book:starting out with java from control struct through objects]

Programming Challenge - Ch. 5: isPrime Method and Prime Number List

See pages 293 & 294: isPrime Method and Prime Number List

A prime number is a number that is only evenly divisible by itself and 1. For example, the number 5 is prime because it can only be evenly divided by 1 and 5 The number 6, however, is not prime because it can be divided evenly by 1, 2, 3, and 6.

Write a method named isPrime, which takes an integer as an argument and returns true if the argument is a prime number, or false otherwise. Use the isPrime method in a program that prints a list of all the prime numbers from 1 through 100.

Explanation / Answer

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Prime
{
   boolean isPrime(int n)
   {
       int i =0;
       for(i=2;i<n;i++)
           {
               if(n%i==0)
                   return false;
           }
    return true;
   }
      
   public static void main (String[] args) throws java.lang.Exception
   {
       // your code goes here
       Prime o = new Prime();
       System.out.println(o.isPrime(7));
       int j;
       for(j=1;j<101;j++)
       {
           if(o.isPrime(j))
           {
               System.out.println(j);
           }
       }
   }
}

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