Choroba didn't tell us if C has the same output too, but I remember the strange rules to numify ASCII strings to integers stemming from an atoi routine in C.

use warnings;
say "12x45"+1;

__END__

Argument "12x45" isn't numeric in addition 
13
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It's not that Larry came up with all of this on his own.

FWIW I don't think this warning was always there...

> Choroba didn't tell us if C has the same output too

Well, it kind of has, but it's a bit tricky as you have to explicitly use printf.

#include <stdio.h>

int main(int argc, char** argv) {
    printf("%f\n",    1.4/10);
    printf("%.17f\n", 1.4/10);
    return 0;
}
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Output:

0.140000
0.13999999999999999
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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Thanks.

My guess is that stringification of floats happens with sprintf "%.15g"

Though the default max-precision for format g seems to be 6, both in Perl and C. ¹

I started testing this theory, but it's a bit cumbersome inside termux. :)

Cheers Rolf
_{(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery}

¹) According to online docs:

• maximum-width
• https://en.cppreference.com/w/c/io/fprintf