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Full Discussion: Let statement
Top Forums Shell Programming and Scripting Let statement Post 302390312 by erora on Wednesday 27th of January 2010 02:05:39 PM
Old 01-27-2010
Let statement
I came across the following program:
Code:
if test $# = 3
then
	case $2 in
	 +) let z=$1+$3;;
	 -) let z=$1-$3;;
	 /) let z=$1/$3;;
	 x|X) let z=$1*$3;;
	 *) echo Warning - $2 invalied operator, only +,-,x,/ operator allowed
	    exit;;
	esac
	echo Answer is $z

What is the usage of let statement? I have never come across the same. Please let me know the usage, syntax and the need.

Instead of using the let statement above, we could have directly used
Code:
case $2 in
	 +)  z=$1+$3;;
	 -)  z=$1-$3;;
	 /)  z=$1/$3;;
	 x|X)  z=$1*$3;;

Then what is the need of using "let" here or anywhere else?
Last edited by Scott; 01-27-2010 at 09:05 PM.. Reason: Please use code tags
 

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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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