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# Programmer Certification Study

Rahul Pawar
Ranch Hand
Posts: 38
Hi all ,
I am confuse about how to convert an integer into octal and hexadecimal representation .
can anybody help me out ???
rahul

Cindy Glass
"The Hood"
Sheriff
Posts: 8521
using java? or doing it by hand?

Rahul Pawar
Ranch Hand
Posts: 38
Originally posted by Cindy Glass:
using java? or doing it by hand?

well actually i need to know how to convert decimals into octals and hexadecimals?
thanks
rahul

Rahul Pawar
Ranch Hand
Posts: 38
Originally posted by Cindy Glass:
OK
The Integer class has a method valueOf(String 2, radix r); That takes the string representation of a number and converts it to the base that you feed in in r.
So to convert 12345 to octal
Integer x = Integer.valueOf(12345, 8);
To convert to hex
Integer x = Integer.valueOf(12345, 16);

thanks for ur reply but still i need to know how to do conversion without using valueOf() method ?
thanks once again
rahul

Cindy Glass
"The Hood"
Sheriff
Posts: 8521
ok.
The Integer class has two methods toHexString and toOctalString.
String s1 = Integer.toHexString(12345);
String s2 = Integer.toOctalString(12345);

Cindy Glass
"The Hood"
Sheriff
Posts: 8521
Well, that was the first question. I guess you want to be able to do it by hand.
(BTW I deleted my first reply - the syntax is WAY wrong).
Normally I do it the hard way. To convert to octal
Assuming a number less that 32,768
____ ___ __ _
4096 512 64 8 etc.
Take the number in decimal and find out how may 4096's are in it. Put that number over the 4096 space. Take the remainder and find out how many 512's are in it, put that over the 512 space. Then find how many 64's are in the remainder, put it over the 64 space. The last number should be <=7 put it over the 8. Now it is in Octal.
[This message has been edited by Cindy Glass (edited March 13, 2001).]

Rahul Pawar
Ranch Hand
Posts: 38
thanks for ur immediate reply but still i am confuse about conversion .
will u give me all the details along with ex. so that i can understand .
thank u very much for ur reply
rahul
Originally posted by Cindy Glass:
Well, that was the first question. I guess you want to be able to do it by hand.
(BTW I deleted my first reply - the syntax is WAY wrong).
Normally I do it the hard way. To convert to octal
Assuming a number less that 32,768
____ ___ __ _
4096 512 64 8 etc.
Take the number in decimal and find out how may 4096's are in it. Put that number over the 4096 space. Take the remainder and find out how many 512's are in it, put that over the 512 space. Then find how many 64's are in the remainder, put it over the 64 space. The last number should be <=7 put it over the 8. Now it is in Octal.
[This message has been edited by Cindy Glass (edited March 13, 2001).]

Rahul Pawar
Ranch Hand
Posts: 38
can anybody help me out regarding conversion by hand from decimals to octals/ hexadecimals
rahul

Cindy Glass
"The Hood"
Sheriff
Posts: 8521
You really need to get a Math tutorial. I haven't really found a good one but:
http://www.wtps.org/wths/imc/math.htm
Meanwhile I found this number converter that is cute:
http://www.uacch.cc.ar.us/science/numnotation.htm

Elizabeth Jacob
Greenhorn
Posts: 28
Hi Rahul,
Are you familiar with binary conversions?
As binary is,representing an integer to its base 2,an octal is representing an integer to its base 8 and hex is to the base 16.
You can convert the number to an octal the same way you find the
binary,except that you divide it by 8 instead of doing it by 2.
IF you want a detailed explanation pl ask.
Elizabeth.

Rahul Pawar
Ranch Hand
Posts: 38
thanks Garath ,
now my concept is clear .
thansk for co-operation
Rahul

Albert Gray
Ranch Hand
Posts: 43
If you know how to convert a floating point decimal number to a floating point binary and vise versa
Albert

Originally posted by Elizabeth Jacob:
Hi Rahul,
Are you familiar with binary conversions?
As binary is,representing an integer to its base 2,an octal is representing an integer to its base 8 and hex is to the base 16.
You can convert the number to an octal the same way you find the
binary,except that you divide it by 8 instead of doing it by 2.
IF you want a detailed explanation pl ask.
Elizabeth.