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greg108

01-12-2005 12:36 AM

java - reading from stdin

I know how to read a String from standart input this way:
Something like:

inStr = reader. readLine(); //reader is a BufferedReader type

and then if I want just one character:

myChar = inStr.charAt(0);

and if I want double:

myDouble = Double. parseDouble(inStr);

But how can I read one character (of char type) or a double without those conversions?

csfalcon

01-12-2005 02:28 AM

Code:

DataInputStream in = new DataInputStream(new BufferedInputStream(System.in));

                

        try

        {

                in.readChar();

                in.readDouble();

        }

        catch (IOException ioe)

        {

        }

greg108

01-12-2005 02:59 PM

Thanks, but when I do this and print the character that I just entered then the output is not a character but a bunch of digits (some kind of binary stream)

I need to read a character and test it with a switch statement.

csfalcon

01-13-2005 02:34 PM

hmm, sorry about that. Seems like readDouble() reads in IEEE representation of double and readChar() read in unicode? Not sure...

But looks like you would have to read it as a string first and parse out the different components.

jlliagre

01-13-2005 03:29 PM

To read characters from a file, try:

Code:

    BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(file)));;

    int i;

    while((i=br.read())!=-1)

    {

      char c=(char)i;

      ...;

    }

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