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Full Discussion: Serioulsy puzzled here.
Top Forums Programming Serioulsy puzzled here. Post 302981543 by wisecracker on Wednesday 14th of September 2016 01:19:02 PM
Old 09-14-2016
Serioulsy puzzled here.

Facebook had a mathematics problem which was as thus:-

6/2(1+2) = ?

Answer is 9.

My ancient Casio FX 730P mini computer written exactly as that gives 'error' only.

Now take a look at shell versions, and a python version:-
Code:
Last login: Wed Sep 14 18:04:04 on ttys000
AMIGA:barrywalker~> echo "$(( 6/2(1+2) ))"
-bash: 6/2(1+2) : syntax error in expression (error token is "(1+2) ")
AMIGA:barrywalker~> echo "$(( 6/2*(1+2) ))"
9
AMIGA:barrywalker~> echo "6/2(1+2)" | bc
(standard_in) 1: parse error
AMIGA:barrywalker~> echo "6/2*(1+2)" | bc
9
AMIGA:barrywalker~> python
Python 2.7.10 (default, Oct 23 2015, 19:19:21) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> print 6/2(1+2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> print 6/2*(1+2)
9
>>> exit()
AMIGA:barrywalker~> _

Are these bugs or is it mandatory in at least these two languages here to have the multiplication operator?

Last edited by wisecracker; 09-14-2016 at 02:27 PM.. Reason: Added the answer.
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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