write aprogram in java to generate 1 to 100 random integers numbers store in an arry then display all those numbers which are prime numbers

please help me how to amke this program thanz.

I don't have my java compiler to hand but I can give you an idea.

you can use the mod operator to find prime numbers

write a java program that will sort three integers the integers are entered from key board and stored in variables num1,num2,num3 respectively.the program sorts the numbers so that num1<=num2<=num3.
this is my 2nd program please help me i it.

hello are u allowed to use an array for second problem?

yes , u can make this program as ur way, and about first one problem, just make the program i will run it with my system, thanx

This is problem one:

import java.util.Random;

class Prime
{

  public static void main (String[] args)
  {
     int[] arrays = new int[100];

     for (int i=0; i<100; i++)
     {
       Random generator = new Random();
       arrays[i] = generator.nextInt(100);
     }
     
     for (int j=0; j<100; j++)
     {
       double root = Math.sqrt(arrays[j]);
      for ( int i = 2; i < = root; i++)
      {
       if (arrays[j] % i == 0 )
        
      }
      System.out.print(arrays[j] + " ");
   }
}
class Sort
{
  

  public static void main (String[] args)
  {
     int[] tmp = new int[3];
     
      tmp[0] = 8;
      tmp[1] = 3;
      tmp[2] = 12;

     for (i=0; i<n-1; i++) 
     {
       for (j=0; j<n-1-i; j++)
        if (a[j+1] < a[j]) 
        {  
         tmp = a[j];         /* swap a[j] and a[j+1]      */
         a[j] = a[j+1];
         a[j+1] = tmp;
        }
      }

      for(int k=0; k<3; k++)
      {
       System.out.print(tmp[k]+" ");
      }

   }
}

you may have to put this in a function to work sorrie...

public static boolean isPrime (array[j])


double root = Math.sqrt(arrays[j]);
      for ( int i = 2; i < = root; i++)
      {
       if (arrays[j] % i == 0 )
        return false;
      }
      return true;

Edited 3 Years Ago by pyTony: fixed formatting

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