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how to convert alphanumeric to numeric

 
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dalib
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Joined: 26 Jul 2008
Posts: 2
Location: hyderabad

PostPosted: Sat Jul 26, 2008 12:48 pm    Post subject: how to convert alphanumeric to numeric
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I need the difference between two alphanumeric numbers.
like if
temp-num1 = "ABCDEF"
and
temp-num2 = "ABCDEH"


I need the temp-num2 - temp-num1 to be stored in third numeric veeriable.
like

temp 9(6).

compute temp = temp-num2 - temp-num1

but since temp-num2 and temp-num1 are alphanumeric
so is there any way to get the difference between these two.
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dbzTHEdinosauer

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PostPosted: Sat Jul 26, 2008 1:12 pm    Post subject:
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nice theoretical homework problem.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
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PostPosted: Sat Jul 26, 2008 2:52 pm    Post subject:
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Hello,

Quote:
so is there any way to get the difference between these two.
Of course there is. . .

Now is where you have to do some work. Post the rule(s) describing how to calculate the difference. Also, rather than the "simple" example you've used (you'd expect a difference of 2, right?) you need to post what you would expect the difference between "AVRDEW" and "JYREXS" to be and how you determined that difference. Once the rule is understood, coding might follow.

Another thought is that you might describe what you are trying to accomplish and someone may have a suggestion.

Please do not post in both forums. . . This topic is locked.
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enrico-sorichetti

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Posts: 10374
Location: italy

PostPosted: Sat Jul 26, 2008 4:11 pm    Post subject: Reply to: how to convert alphanumeric to numeric
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given the following digits sequence

arbdgts = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

jyrexs - avrdev = 9301IX

happy multibasing computations

here is the rexx to do it

Code:

#! /bin/rexx
/*REXX- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*                                                                   */
/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
Trace "O"
OPTIONS "STRICT_WHITE_SPACE_COMPARISONS"
numeric digits 64
arbdgts  = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

n2 = to_dec("AVRDEV")
c2 = to_arb(n2)
say c2
n1 = to_dec("jyrexs")
c1 = to_arb(n1)
say c1
nx = n1 - n2

diff = to_arb(nx)

say "jyrexs - avrdev  = " diff

exit

to_dec:procedure expose arbdgts
   trace "O"
   parse upper arg arbn
   base  = length(arbdgts)
   mult  = 1
   decn  = 0
   do  d = length(arbn) to 1 by -1
      work = substr(arbn,d,1)
      decn = decn + mult * ( pos(work,arbdgts) - 1 )
      mult = mult * base
   end
   return decn

to_arb:procedure expose arbdgts
   trace "O"
   parse upper arg decn
   base = length(arbdgts)
   arbn = ""
   do while ( decn >= base )
      work = decn //  base
      decn = decn % base
      arbn = substr(arbdgts,work+1,1) || arbn
   end
   arbn = substr(arbdgts,decn+1,1) || arbn
   return arbn
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