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Re: is my loop issue a data conversion bug?

From: arnold
Subject: Re: is my loop issue a data conversion bug?
Date: Thu, 16 Jul 2020 05:37:24 -0600
User-agent: Heirloom mailx 12.5 7/5/10


The gawk doc discusses *how* numbers get converted to strings (and vice versa)

Your confusion lies more with comparisons; the canonical rules are here:

Here's what's going on.

First, remember than array indices always strings. When you write

        a[1] = 1

it's as if you wrote

        a["1"] = 1.

On to your program:

END     {
        for (len in words) { <---- len is always a string
                        for (i=1; i<=len; i++ ) { # lenn works, len does not

Consider what happens at the for(;;) loop.  The comparison is

        number <= string

This gets turned into

        string <= string

As seen here, this isn't what you want:

        $ gawk 'BEGIN { print ("89" < "9") }'

Thus you must force len into being numeric by adding 0 to it.

I hope this helps.


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