base-conversion

Is there any way to convert decimal to binary, or binary to decimal, in Oracle 10g without having to first define a function? I have limited database access (SELECT only) and all the solutions for this I've found online seem to involve CREATE FUNCTION , which does not work for me. If hexadecimal is good enough, then TO_CHAR and TO_NUMBER can work: SQL> select to_char(31, '0x') from dual; TO_ --- 1f SQL> select to_number('1f', '0x') from dual; TO_NUMBER('1F','0X') -------------------- 31 You may be able to use the RAWTOHEX() and HEXTORAW() functions to make the hex to binary transition as well.

I currently convert base10 numbers to base64 in PHP. but I haven't any idea for convert base64 to base10 in php! How can I do it? my algorithm for convert base10 to base64: $rep = array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','-','_'); $new = ""; while ($num>0) { $r = $num % 64; $new .= $rep[$r]; $num = floor($num/64); } Here is a Javascript way of doing it. Perhaps you can code one for

I would like to reverse the operation performed by the following bash command: $ echo $((62#a39qrT)) 9207903953 i.e. convert decimal 9207903953 to base 62 , keeping bash standard of {0..9},{a..z},{A..Z} . I know I can do this by using bc , but I will have to manually convert each character then. For example, I do this currently: BASE62=($(echo {0..9} {a..z} {A..Z})) for i in $(echo "obase=62; 9207903953" | bc) do echo -n ${BASE62[$i]} #Doesn't work if bc's output contains leading zeroes done There must be a way to do this in a less 'hackier' way. Do you know of a way to do this more

Does .NET have a native function that is equivalent to PHP's base_convert or will I need to write my own? I want to convert from any base to any other base -- where either the 'to' base or the 'from' base can be any integer 2-36. Example of the PHP function: base_convert($number_to_convert, $from_base, $to_base) // convert 101 from binary to decimal echo base_convert('101', 2, 10); // 5 As noted by Luke in the comments of Jon Skeet's answer: Convert.ToString can't handle conversion to/from any arbitrary base, only 2, 8, 10 and 16 Update: Apparently, the answer is: no, there is no native way.

I need to convert a large (too large for the built-in data types) hex string to a string with it's decimal representation. For example: std::string sHex = "07AA17C660F3DD1D2A1B48F1B746C148"; std::string sDec; // should end up with: "10187768649047767717933300899576725832" I'm currently using the c++ BigInt Class which offers a very easy way to achieve this (but is GPL only): BigInt::Vin vbiTemp(sHex, 16); sDec = vbiTemp.toStrDec(); Is there simple way to do this conversion without a 3rd party arithmetic library? Or can you recommend a free (non-GPL) alternative with similar simplicity

Is there a platform function that will do the following? convertBase :: (Num a, Num b) => Int -> Int -> [a] -> [b] Convert a number from base 'a' to base 'b' where each list item is a digit in the number. for example: convertBase 2 10 [1,1,0,1] = [1, 3] I hope that makes sense, let me know if i can clear anything up Using the digits package from Hackage: import Data.Digits (digits, unDigits) convertBase :: Integral a => a -> a -> [a] -> [a] convertBase from to = digits to . unDigits from You can add a fromIntegral in there if you need the input and output types to be different. Also, the