Character.Min_Radix

[Arpana Rai]

i found the follwing Q in dan's mock test.What i am unable to understand the effect of 2nd paramerter of valueOF(String s, int radix) method.
Some one plz help me.

class D {
public static void main (String args[]) {
Byte b1 = Byte.valueOf("10",Character.MIN_RADIX);
Byte b2 = Byte.valueOf("10",8);
Byte b3 = Byte.valueOf("10",10);
Byte b4 = Byte.valueOf("10",16);
Byte b5 = Byte.valueOf("10",Character.MAX_RADIX);

System.out.print(b1+","+b2+","+b3+","+b4+","+b5);

}
}

thanx in advance.
regds
Arpana

[Dan Chisholm]

The radix is the base of the number system. If the radix is 10 then the number is a base 10 representation of a value.
The number 10 in base 8 is represented in decimal as the number 8. The number 10 in base 16 is represented in decimal as 16.

[Samith Nambiar]

Dan:
i agree that radix is the base of the number system ... but i fail to understand the following example from the API docs of Integer class parseInt(String s, int radix) method.

parseInt("Kona", 27) returns 411787

/SAmith

[Arpana Rai]

Dan,
can you plz explain that with some nice examples.
thanx
regds
Arpana

[Dan Chisholm]

Originally posted by Arpana Rai:
Dan,
can you plz explain that with some nice examples.
thanx
regds
Arpana

class F {
  public static void main (String args[]) {
    Byte b1 = Byte.valueOf("1",10);
    Byte b2 = Byte.valueOf("10",10);
    Byte b3 = Byte.valueOf("100",10);
    System.out.print(b1+","+b2+","+b3);
  }
}
prints: 1,10,100

class E {
  public static void main (String args[]) {
    Byte b1 = Byte.valueOf("1",8);
    Byte b2 = Byte.valueOf("10",8);
    Byte b3 = Byte.valueOf("100",8);
    System.out.print(b1+","+b2+","+b3);
  }
}
prints: 1,8,64

class D {
  public static void main (String args[]) {
    Byte b1 = Byte.valueOf("1",2);
    Byte b2 = Byte.valueOf("10",2);
    Byte b3 = Byte.valueOf("100",2);
    Byte b4 = Byte.valueOf("1000",2);
    System.out.print(b1+","+b2+","+b3+","+b4);
  }
}
Prints: 1,2,4,8

[Vin Kris]

Originally posted by Samith Nambiar:
parseInt("Kona", 27) returns 411787

Treat this similar to Index 16 - instead use 27.
(K * 27 ^ 3) + (O * 27 ^ 2) + (N * 27 ^ 1) + (A * 27 ^ 0)
For Base-16, we have 0 to 9 and A,B,C,D,E,F for numbers from 10 to 15.
Similarly for Base-27, You'd have numbers from 0 to 9 and then alphabets starting from 'A' representing the numbers from 10 to 26. Alphabet 'R' would represent numeric 26. Therefore you cannot call parseInt() on any string that contains alphabets beyond 'R' using the radix as 27.
For ex: if you change the call as follows:
pasreInt("Sona", 27) --> This should throw an exception.

[Arpana Rai]

Thanx Dan and Vin for such a nice explanation.

regds
Arpana

[Samith Nambiar]

thanks Vin i get it now
/SAmith