Help neede urgently(Problem in adding exponential numbers)

Hi,
Actually i want to add the contents of two files which contains exponential numbers.
i'm not able to add these numbers. Can any one help me?
import java.io.*;
import java.nio.*;
class  userFile
     public static void main(String[] args) throws IOException
          try
               BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
          String s1,s2,s3;
          FileReader fr1,fr2;
          System.out.println("Enter first file :");
          s1=br.readLine();
          System.out.println("Enter second file :");
          s2=br.readLine();
          System.out.println("Enter new file :");
          s3=br.readLine();
          fr1= new FileReader(s1);
          fr2= new FileReader(s2);
          BufferedReader fin1=new BufferedReader(fr1);
          BufferedReader fin2=new BufferedReader(fr2);
          String str1,str2,str3;
          double i1,i2,i3;
          OutputStream fout=new FileOutputStream(s3);
          while((str1=fin1.readLine()) != null)
               while((str2=fin2.readLine()) != null)
               i1=Float.parseFloat(str1);
               System.out.println(i1);
               i2=Float.parseFloat(str2);
               System.out.println(i2);
               i3=i1+i2;
               System.out.println("i3=" +i3);
               str3 = Float.toString(i3);
               byte buf[]=str3.getBytes();
               fout.write(buf);
               fout.write('\n');
          catch(NumberFormatException e)
               System.out.println(e);
}I need help urgently.
Thanks in advance.

By "exponential number, do you mean one in scientific notation (eg. -1.55743e21) or what?
What do your files look like?
What problem are you encountering? Is an exception being thrown? If so, give us the exact message (copy/paste). Is the results simply not what was expected? If so, give us the input, the expected results and the actual results for us to compare and consider.
Chuck

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