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Full Discussion: String Conversion in awk
Top Forums Shell Programming and Scripting String Conversion in awk Post 62274 by vgersh99 on Monday 14th of February 2005 04:05:13 PM
Old 02-14-2005
Quote:
Originally Posted by rohanrege
Thanks for the reply, but

Is there any other setting i.e Built in variables. or any other setting that affects how the string "000" is converted to 0 automatically in windows and not in Unix.
Cannot recall, but ....... CONVFMT is somewhat related, but I could not get it working as expected.

Here's another scenario:
Code:
BEGIN {
   VOID="Y"
   A="000"

   if ( (VOID == "Y") && (A == 0) )
      print "YES"
   else
      print "NO"
}

The above outputs "NO" for awk, nawk, /usr/xpg4/bin/awk and gawk [on Solaris].

Code:
BEGIN {
   VOID="Y"
   A=000

   if ( (VOID == "Y") && (A == 0) )
      print "YES"
   else
      print "NO"
}

The above outputs "YES" for all the awk's mentioned above.

This is somewhat strange, but doing 'man nawk' on Solaris:
Quote:
expr == expr Equal to
............. other expressions......


Each expression has either a string value, a numeric value
or both. Except as stated for specific contexts, the value
of an expression is implicitly converted to the type needed
for the context in which it is used
. A string value is con-
verted to a numeric value by the equivalent of the following
calls:

setlocale(LC_NUMERIC, "");
numeric_value = atof(string_value);

A numeric value that is exactly equal to the value of an
integer is converted to a string by the equivalent of a call
to the sprintf function with the string %d as the fmt argu-
ment and the numeric value being converted as the first and
only expr argument. Any other numeric value is converted to
a string by the equivalent of a call to the sprintf function
with the value of the variable CONVFMT as the fmt argument
and the numeric value being converted as the first and only
expr argument.
Based on my examples, it seems like under Solaris the "context" of yje comparision is defined by the type of the LEFT expression.

Actually I just tried the same test under MKS's awk on Windows and does work the SAME as it does on Solaris. And also it behaves the same under Cygwin's awk and gawk under Windows as well - well, at least for the test scenarios I've outlined above.

Last edited by vgersh99; 02-14-2005 at 05:26 PM..
 

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