awk, floating point and rounding Post: 302488947

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Top Forums Shell Programming and Scripting awk, floating point and rounding Post 302488947 by fpmurphy on Wednesday 19th of January 2011 12:09:44 AM

01-19-2011

Registered User

The "error" is due to the default rounding.

Code:

BEGIN   {
        for (i=5; i < 7; i+=1) {
                printf "Pass %s...\n",i
                for (j = 0.0; j < (0.1*i); j = j + 0.1) {
                        printf "j=%.20f %.20f\n", j, .1*i;
                }
        }
exit
}

Code:

Pass 5...
j=0.00000000000000000000 0.50000000000000000000
j=0.10000000000000000555 0.50000000000000000000
j=0.20000000000000001110 0.50000000000000000000
j=0.30000000000000004441 0.50000000000000000000
j=0.40000000000000002220 0.50000000000000000000
Pass 6...
j=0.00000000000000000000 0.60000000000000008882
j=0.10000000000000000555 0.60000000000000008882
j=0.20000000000000001110 0.60000000000000008882
j=0.30000000000000004441 0.60000000000000008882
j=0.40000000000000002220 0.60000000000000008882
j=0.50000000000000000000 0.60000000000000008882
j=0.59999999999999997780 0.60000000000000008882

fpmurphy

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LEARN ABOUT REDHAT

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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