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Home -> Community -> Usenet -> c.d.o.misc -> Re: Does anyone know how to convert from decimal to hex???
On 19 Jun 1997 21:16:05 GMT, tcbracey_at_st.usm.edu (Timothy C. Bracey) wrote:
>I'm wokring on a project that requires me to have hex values. Currently they
>are stored as decimal. Does anyone know a way of converting from dec. to
>hex. without having to use or write some pro C code?
>
>--
>---------------
>Timothy Corey Bracey
>Southern Station Box 4591
>University of Southern Mississippi
>Hattiesburg, MS 39406
>E-Mail: tcbracey_at_sushi.st.usm.edu
>Campus Phone: 601-266-1037
Here are some functions that convert base N to base M
create or replace function to_base( p_dec in number, p_base in number )
return varchar2
is
l_str varchar2(255) default NULL; l_num number default p_dec; l_hex varchar2(16) default '0123456789ABCDEF'; begin if ( trunc(p_dec) <> p_dec OR p_dec < 0 ) then raise PROGRAM_ERROR; end if; loop l_str := substr( l_hex, mod(l_num,p_base)+1, 1 ) || l_str; l_num := trunc( l_num/p_base ); exit when ( l_num = 0 ); end loop; return l_str;
create or replace function to_dec
( p_str in varchar2,
p_from_base in number default 16 ) return number
is
l_num number default 0; l_hex varchar2(16) default '0123456789ABCDEF'; begin for i in 1 .. length(p_str) loop l_num := l_num * p_from_base + instr(l_hex,upper(substr(p_str,i,1)))-1; end loop; return l_num;
create or replace function to_hex( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 16 );
end to_hex;
/
create or replace function to_bin( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 2 );
end to_bin;
/
create or replace function to_oct( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 8 );
end to_oct;
/
set arraysize 1
column x format a10
column y format 9999999
select rownum, to_hex(rownum) x, to_bin(rownum) x, to_oct(rownum) x
from all_users;
select rownum, to_dec(to_hex(rownum),16) Y,
to_dec(to_bin(rownum),2 ) y, to_dec(to_oct(rownum),8) y from all_users;
Thomas Kyte
tkyte_at_us.oracle.com
Oracle Government
Bethesda MD
http://govt.us.oracle.com/ -- downloadable utilities