Checking for "*" In a Variable Post: 302475794

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Homework and Emergencies Homework & Coursework Questions Checking for "*" In a Variable Post 302475794 by lee.n.doan on Tuesday 30th of November 2010 01:41:44 AM

11-30-2010

Registered User

Checking for "*" In a Variable

Hey folks, thanks in advance for any help or advice.

1. The problem statement, all variables and given/known data:

I'm supposed to write a script that takes 3 arguments, like "compute.sh 1 + 2" where the middle one will be +,-,/, or * and output the operation and the result.

2. Relevant commands, code, scripts, algorithms:

It is in bourne shell.

3. The attempts at a solution (include all code and scripts):

Code:

#!/bin/sh

compute()
{
	if [ $# -eq 3 ]; then
		if [ $2 = "+" -o $2 = "-" -o $2 = "/" -o $2 = "*" ]; then
			answer=`expr $1 $2 $3`
			echo $answer
		else
		echo "Please enter proper arguments."		
		
		fi

	else
		echo "Please only enter three arguments."
	fi
}

compute $1 $2 $3

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
University of Notre Dame, IN; Freeland, CSE30189

This script works for +, -, and /, but when I get to the *, it fails the if test. I think it has something to do with * being a wildcard? However, I thought the quotes would make it literal...

Last edited by DukeNuke2; 11-30-2010 at 04:33 AM..

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LEARN ABOUT MOJAVE

ppi::statement::variable5.18

PPI::Statement::Variable(3)				User Contributed Perl Documentation			       PPI::Statement::Variable(3)

NAME

       PPI::Statement::Variable - Variable declaration statements

SYNOPSIS

	 # All of the following are variable declarations
	 my $foo = 1;
	 my ($foo, $bar) = (1, 2);
	 our $foo = 1;
	 local $foo;
	 local $foo = 1;
	 LABEL: my $foo = 1;

INHERITANCE

	 PPI::Statement::Variable
	 isa PPI::Statement::Expression
	     isa PPI::Statement
		 isa PPI::Node
		     isa PPI::Element

DESCRIPTION

       The main intent of the "PPI::Statement::Variable" class is to describe simple statements that explicitly declare new local or global
       variables.

       Note that this does not make it exclusively the only place where variables are defined, and later on you should expect that the "variables"
       method will migrate deeper down the tree to either PPI::Statement or PPI::Node to recognise this fact, but for now it stays here.

METHODS

   type
       The "type" method checks and returns the declaration type of the statement, which will be one of 'my', 'local', 'our', or 'state'.

       Returns a string of the type, or "undef" if the type cannot be detected (which is probably a bug).

   variables
       As for several other PDOM Element types that can declare variables, the "variables" method returns a list of the canonical forms of the
       variables defined by the statement.

       Returns a list of the canonical string forms of variables, or the null list if it is unable to find any variables.

   symbols
       Returns a list of the variables defined by the statement, as PPI::Token::Symbols.

TO DO

       - Write unit tests for this

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2011 Adam Kennedy.

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

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.18.2							    2011-02-25					       PPI::Statement::Variable(3)