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Thread: String to Int

  1. #1
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    Default String to Int

       import java.io.*;
       import java.net.*;
       import java.util.*;
       import java.lang.*;
       import javax.swing.JOptionPane;
       import java.text.DecimalFormat;
       import java.text.NumberFormat;
       import java.math.*;
     
       public class EchoClient
       {
          public static void main(String[] args)
          {
          // declare objects we require
             Socket  localSocket;
             BufferedReader in;
             BufferedReader kbdInput;
             PrintWriter out;
             String hostname = new String();
             String s, s1;
     
             BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
     
     
     
             System.out.println("Server IP Address : ");
             try
             {
                hostname = input.readLine( );
             }
                catch(Exception e)
                {
                   System.out.println("Exception: " + e.getMessage( ) + "has occurred");
                }
     
     
             try
             {
             // create a socket connected to remote Port 9999; DNS lookup is automatic
                localSocket = new Socket (hostname, 9999);
     
                      // acknowledgement of connection request
                System.out.println(" Connection made with " + localSocket.getInetAddress( ) +
                      "\nRemote Port: " + localSocket.getPort( )+
                      "\nLocal Port: " + localSocket.getLocalPort( ));
     
             // set up data streams in and out of socket and from keyboard
                in = new BufferedReader(new InputStreamReader(localSocket.getInputStream( )));
                out = new PrintWriter(localSocket.getOutputStream( ));
                kbdInput = new BufferedReader(new InputStreamReader(System.in));
     
             // Lab 2 - (2)(a) Bob uses PublicAlice key to encrypt a plaintext message M
     
                BigInteger n,e, p,q,d, exponent;
     
                s1 = in.readLine( );
                System.out.println("Value of n: "+s1);
                n = new BigInteger(s1);
     
                s1 = in.readLine( );
                System.out.println("Value of e: "+s1);
                e = new BigInteger(s1);
     
     
             // while we have a connection
                while (true)
                {
                   BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
                // read keyboard to String
                   //s = kbdInput.readLine( );
                // Lab 2 - (2)(b) Bob uses PublicAlice key to encrypt a plaintext message M
                   char M;
     
                               System.out.println("Enter value of M: ");
                                 String word = buff.readLine(); 
     
     
                               int j = Integer.valueOf(word).intValue();
                   BigInteger b1 = BigInteger.valueOf(j);                     
                   BigInteger num = b1.modPow(e,n);
                   NumberFormat matter = new DecimalFormat("#0");
                                 System.out.println(matter.format(num));
     
     
     
                   out.println(num);
                   out.flush();   
                   //}         	
                   System.out.println(in.readLine( ));
                }
             }
                catch (UnknownHostException e)
                {
                   System.out.println(e.getMessage( ));
                }
                catch (IOException e)
                {
                   System.out.println(e.getMessage( ));
                }
          }
     
       }
    System.out.println("Enter value of M: ");
    String word = buff.readLine();


    int j = Integer.valueOf(word).intValue();

    i am try to convter a string, like eg: HI into int. However it give me error and how to do anyway?


  2. #2
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    Default Re: String to Int

    The Integer.valueOf method expects a String representation of a number, e.g. "45". It doesn't know the int value of "HI", neither do I. What is the int value you think "HI" should have?

  3. #3
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    Default Re: String to Int

    the value of HI is 72, 73 because H in ascii is 72 ans I is 73. But now i want HI together is it need to (72*73)=HI?

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    Default Re: String to Int

    Hint:
    System.out.println((int)'a');

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    Default Re: String to Int

    Quote Originally Posted by Joy123 View Post
    the value of HI is 72, 73 because H in ascii is 72 ans I is 73. But now i want HI together is it need to (72*73)=HI?
    '72, 73' is not an int. The compiler is not a mind-reader - you can get the UNICODE value of each character (equivalent to ASCII for the latin alphabet) by casting to an int as Junky shows above. What you do with the two character values is up to you.

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    Default Re: String to Int

    How to do? Can show example?

  7. #7
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    Default Re: String to Int

    If you want to convert some int values to single character Strings and then concatenate them.
    If the int values can be cast to char, the String class has a constructor to create a String.
    Then use + to concatenate the Strings.

    Can you give some examples of a String and the int value that you want to convert it to?

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    Default Re: String to Int

    Quote Originally Posted by Joy123 View Post

    i am try to convter a string, like eg: HI into int. However it give me error and how to do anyway?
    Pardon me if this is a noob answer....

    But have you tried using parseInt?

    i.e:
    String HI = whatever it equals
    int hi = Integer.parseInt(HI);

  9. #9
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    Default Re: String to Int

    I read the question as: How to convert the String "HI" to an int value.
    Try this: System.out.println("HI=" + Integer.parseInt("HI", 26)); // HI=460

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    Default Re: String to Int

    Anyway Thank for tips and guide

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    Default Re: String to Int

    Quote Originally Posted by Norm View Post
    I read the question as: How to convert the String "HI" to an int value.
    Try this: System.out.println("HI=" + Integer.parseInt("HI", 26)); // HI=460
    nice one - base 26 does have some uses after all!

  12. #12
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    Default Re: String to Int

    What is the word for that base? Hexadecimal for 16. My latin is too old.

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    Default Re: String to Int

    Quote Originally Posted by Norm View Post
    What is the word for that base? Hexadecimal for 16. My latin is too old.
    Hexavigesimal - Wikipedia, the free encyclopedia
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  14. #14
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    Default Re: String to Int

    public class Test{
        public static void main(String[] args){
            String HI = "HI";
            String s = "";
            for (int i=0;i<HI.length();i++){
                char a = HI.charAt(i);
                int j = a;
                s=s+j;
            }
            System.out.println(s);
        }
    }
    Last edited by navis; June 22nd, 2011 at 05:49 AM.

  15. #15
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    Default Re: String to Int

    navis- why have you resurrected an old post? Why have you attempted to spoon-feed the OP an answer instead of offering hints? I'm pretty sure that your attempt is incorrect anyway, but since the OP never truly specified what the requirements were, we can't tell.

    Either way, I don't really see the point of your post. I appreciate you trying to help, but spoon-feeding is NOT helping, and resurrecting old threads is pretty fruitless.
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    Default Re: String to Int

    My apologies KW. I got the point.

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    Default Re: String to Int

    Quote Originally Posted by navis View Post
    My apologies KW. I got the point.
    It's okay. Helping out is great, but spoonfeeding answers is not great, and resurrecting old posts usually is a waste of time. Welcome to the forums.
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