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1. The problem statement, all variables and given/known data:
This is my problem for the class.
Write a script that asks for the user's age. If it is equal to or higher than 16, print a message saying that
this user is allowed to drink alcohol. If the user's age is below 16, print a message telling the user how
many years he or she has to wait before legally being allowed to drink.
As an extra, calculate how much beer an 18+ user has drunk statistically (100 liters/year) and print
this information for the user.
I can make it do the if older than 16 then you can drink
Also If you are 15 or younger than you have to wait X years until you can drink
My problem id with the calculation of how many liters you have drank since 18+.
3. The attempts at a solution (include all code and scripts):
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Oklahoma State Institute of Technology
Okmulgee, Oklahoma
USA
Professor Fil Guinn
ITD 2313-SCRIPT PROGRAMMING-SEC LECNT1
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
$ inside a (( )) block is redundant. So are mathematical assignments outside it.
most times your are right.but some older version of sh(like ash , that is usually not Posix compliant on many systems) your syntax is invalid.
[[ *maybe it is various of evulation expression bug of a ash.]]
(so its meant some older versions of (bourne) sh(s) like (0.38) has it, and i cannot test newer version ash(0.4 or newer if there is) so ash is not compability to SUSv3.
actually aritmetic expansion is defined for SUSv3
`Arithmetic Precision and Operations`
in Introduction
`2.6.4 Arithmetic Expansion`
in Shell Command Language]
now lets look at the belows..
[not expanded values before aritmetic expression]
it is required a `$` before variables
in sh another interesting issue
--try 1
--try 2 --try 3 is like OK , but?
but is not.
regards
ygemici
You guys are conflating two different POSIX shell mechanisms here. One is the arithmetic expansion and the other is command expansion. These are different.
$(()) denotes arithmetic expansion, and $() denotes command expansion.
Shells that support $() or $(()) generally support both. For older shells that do not support these syntaxes, you need to use backticks (`) for command expansion and arithmetic expansion isn't supported. In arithmetic expansion, Corona rightly reports that you do not need $ to expand variables; however, you do need this in command expansion. For example:
However:
OTOH, if we give it an expr command:
We need explicit variable expansion:
BTW, if we want compatibility with older shells that do not support arithmetic expansion, we generally are not going to be able to use new-style command expansion, so we want something like this, instead:
You guys are conflating two different POSIX shell mechanisms here. One is the arithmetic expansion and the other is command expansion. These are different.
$(()) denotes arithmetic expansion, and $() denotes command expansion.
Shells that support $() or $(()) generally support both. For older shells that do not support these syntaxes, you need to use backticks (`) for command expansion and arithmetic expansion isn't supported. In arithmetic expansion, Corona rightly reports that you do not need $ to expand variables; however, you do need this in command expansion. For example:
However:
OTOH, if we give it an expr command:
We need explicit variable expansion:
BTW, if we want compatibility with older shells that do not support arithmetic expansion, we generally are not going to be able to use new-style command expansion, so we want something like this, instead:
we dont conflating anything.we are talking just arithmetic expansion about all shell variants.
I was referring to mentioned syntax of "$((x+y))" expression gives error on the some older shells..
In addition, I mentioned what i identified a issue that is maybe a bug in ash.
because of it(false statement) does not give any error at try of 3rd.
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