java program for prime checking

/*Prime checking using java through keyboard input
  By sanjay kumar singh,ggsestc*/


import java.io.*;
import java.lang.*;
class prime5
{
    public static void main(String args[]) throws IOException
    {
      DataInputStream in=new DataInputStream(System.in);
      int no;
      System.out.println("Enter any number:");
      no=Integer.parseInt(in.readLine());
      for(int c=2;c<=Math.sqrt(no);c++)
       {
           if(no%c==0)
           {
             System.out.println("number is not prime");
             System.exit(0);
           }
           else
           System.out.println("number is prime");
      }
  }
}

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java program for addition of two numbers

/*Addition of two numbers using keyboard
    By sanjay kumar singh,ggsestc*/

//By using readLine method()


import java.io.*;
class addition
{
public static void main(String args[]) throws IOException
        {
             float no3;             
             DataInputStream in=new DataInputStream(System.in);
             System.out.println("enter  1st float value for addition:");
             float no1=Float.valueOf(in.readLine()).floatValue();
             System.out.println("enter  2nd float value for addition:");
             float no2=Float.valueOf(in.readLine()).floatValue();
             no3=no1+no2;            
             System.out.println("value of addition is:"+no3);
         }
} 
----output----