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Full Discussion: Convert a String to a Number
Top Forums Shell Programming and Scripting Convert a String to a Number Post 302994017 by rbatte1 on Friday 17th of March 2017 12:51:09 PM
Old 03-17-2017
You need to be careful that you validate the input, else you can end up with this:-
Code:
$ typeset -i wally
$ wally=abc
$ echo $wally
0
$ wally=123abc456
bash: 123abc456: value too great for base (error token is "123abc456")
$

Perhaps you would be better to do something more like this after you read in num1 & num2:-
Code:
vnum1=$(tr -cd "[0-9]" < <(echo $num1))
if [ "$vnum1" != $"num1" ]
then
   echo "Invalid input!"
   exit
fi

It's a bit messy, but keeping it all as strings means that the shell doesn't care what the contents are. You can always for it to an integer afterwards should you wish.



I hope that this helps,
Robin
 

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LEARN ABOUT DEBIAN

graphics::primitive::insets

Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME

       Graphics::Primitive::Insets - Space between things

DESCRIPTION

       Graphics::Primitive::Insets represents the amount of space that surrounds something.  This object can be used to represent either padding
       or margins (in the CSS sense, one being inside the bounding box, the other being outside)

SYNOPSIS

	 use Graphics::Primitive::Insets;

	 my $insets = Graphics::Primitive::Insets->new({
	   top	   => 5,
	   bottom  => 5,
	   left    => 5,
	   right   => 5
	 });

METHODS

   Constructor
       new Creates a new Graphics::Primitive::Insets.

   Instance Methods
       as_array
	   Return these insets as an array in the form of top, right, bottom and left.

       bottom
	   Set/Get the inset from the bottom.

       equal_to
	   Determine if these Insets are equal to another.

       left
	   Set/Get the inset from the left.

       right
	   Set/Get the inset from the right.

       top Set/Get the inset from the top.

       zero
	   Sets all the insets (top, left, bottom, right) to 0.

AUTHOR

       Cory Watson, "<gphat@cpan.org>"

SEE ALSO

       perl(1)

COPYRIGHT &; LICENSE
       Copyright 2008-2010 by Cory G Watson.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.12.3							    2010-08-21					  Graphics::Primitive::Insets(3pm)
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