System.in.read(); strange error!

[kantze]

Hi, i'm new to java. I'm trying to read an integer and to print it.

Here is what i've done so far...

import java.io.IOException;

public class helloworld {

	public static void main(String[] args) throws IOException {
		int a = System.in.read();
       System.out.println(a);
}
}

The problem is, that if for example i write 3 the console prints 51 ( its' ansi representation, i guess??)

I must write this

 System.out.println( (char)a);

to make it work.

But, when I do this

import java.io.IOException;

public class helloworld {

	public static void main(String[] args) throws IOException {
		int a = 3;
       System.out.println(a);
}
}

everything is printed right.

Could anyone tell me what's happening??

[Rajesh]

System.in.read() method reads the next byte of data from inputstream. The Value byte is returned as an int in the range 0 to 255. If no byte is available the value -1 is returned.

But in the code fragment int a=3; we are assinging integer value to position allocated for integer variable a. So it creates no problem.

hope is usefull,
thank you

[Rajesh]

Instead you may try with this simple code to read an integer from console


import java.io.DataInputStream;
public class demo
{
public static void main(String s[])
{
int a;
DataInputStream dis = new DataInputStream(System.in);
a=Integer.parseInt(dis.readLine());
System.out.println(a);
}
}