primenumbers java

1public class Prime {
2    public static void main(String[] args) {
3
4        int num = 29;
5        boolean flag = false;
6        for(int i = 2; i <= num/2; ++i){
7            if(num % i == 0){
8                flag = true;
9                break;
10            }
11        }
12
13        if (!flag)
14            System.out.println(num + " is a prime number.");
15        else
16            System.out.println(num + " is not a prime number.");
17}}

1public class Prime {
2    public static void main(String[] args) {
3
4        int num = 29;
5        boolean flag = false;
6        for(int i = 2; i <= num/2; ++i){
7            if(num % i == 0){
8                flag = true;
9                break;
10            }
11        }
12
13        if (!flag)
14            System.out.println(num + " is a prime number.");
15        else
16            System.out.println(num + " is not a prime number.");
17}}
18Source:www.progra
19

1It will display the prime numbers between 1 and 100.
2
3class PrimeNumbers
4{
5   public static void main (String[] args)
6   {		
7       int i =0;
8       int num =0;
9       //Empty String
10       String  primeNumbers = "";
11
12       for (i = 1; i <= 100; i++)         
13       { 		  	  
14          int counter=0; 	  
15          for(num =i; num>=1; num--)
16	  {
17             if(i%num==0)
18	     {
19 		counter = counter + 1;
20	     }
21	  }
22	  if (counter ==2)
23	  {
24	     //Appended the Prime number to the String
25	     primeNumbers = primeNumbers + i + " ";
26	  }	
27       }	
28       System.out.println("Prime numbers from 1 to 100 are :");
29       System.out.println(primeNumbers);
30   }
31}