github.com/benhoyt/goawk@v1.8.1/testdata/gawk/strnum1.awk (about)

     1  # Date: Tue, 04 Jul 2006 21:06:14 +0200 (MEST)
     2  # From: Heiner Marxen <Heiner.Marxen@DrB.Insel.DE>
     3  # Subject: conversion error
     4  # To: bug-gawk@gnu.org
     5  # Message-id: <200607041906.k64J6Eqa019360@drb9.drb.insel.de>
     6  # 
     7  # Hello,
     8  # 
     9  # The following awk script fails for gawk 3.1.4 and 3.1.5.
    10  # Older versions did not do this, but I cannot say, how old they were.
    11  # 
    12  BEGIN {
    13      if( 0 ) {		#ok
    14  	t = "8"
    15      }else {		#fails
    16  	t = ""
    17  	t = t "8"
    18      }
    19      printf("8  = %d\n", 0+t)	# ok without this line
    20      t = t "8"			# does not invalidate numeric interpretation
    21      printf("88 = %s\n", 0+t)
    22      ## The above prints "88 = 8" with gawk 3.1.4 and 3.1.5
    23  }
    24  # 
    25  # 
    26  # The following one-liner already exhibits the bug:
    27  # 
    28  # gawk 'BEGIN{t=""; t=t "8";printf("8=%d\n", 0+t);t=t "8";printf("88=%s\n", 0+t)}'
    29  # 
    30  # 
    31  # Preliminary observation: under somewhat strange conditions a variable
    32  # does retain its numeric interpretation although something is appended to it.
    33  # -- 
    34  # Heiner Marxen				http://www.drb.insel.de/~heiner/
    35  #