 |  |  |  |  |  |  |  |
help
Please support our C advertiser: Programming Forums - DaniWeb Sister Site
 |
following is a simple embedded c piece of code, can somebody tell me is there a problem in it ?
i am new to embedded programming. It will be great help, any pointers to this ...
thanks
pdk
c Syntax (Toggle Plain Text)
thanks
pdk
Last edited by Narue; Jul 12th, 2008 at 9:44 am. Reason: Added code tags
>can somebody tell me is there a problem in it ?
Assuming boolean is a typedef, there's nothing syntactically or semantically wrong with that function. Perhaps if you told us what it's supposed to do, we can tell you if it actually does it.
Assuming boolean is a typedef, there's nothing syntactically or semantically wrong with that function. Perhaps if you told us what it's supposed to do, we can tell you if it actually does it.
New members chased away this month: 5
it was asked for me in the test. where they asked me
1.what the code does and
2. the potential problem with that.
i answered, If any of the last 3 lsb bits of the number is set to '1' return '0'. Else return 1. and i could not see any potential problem in that..
1.what the code does and
2. the potential problem with that.
i answered, If any of the last 3 lsb bits of the number is set to '1' return '0'. Else return 1. and i could not see any potential problem in that..
•
•
Join Date: Dec 2005
Posts: 5,850
Reputation: 
Solved Threads: 751
Your analysis is correct.
But whether there is anything 'wrong' depends on what it's supposed to do.
If for example is was a test to see if a number was >= 8, then it would fail miserably on negative numbers.
The name 'new' certainly doesn't help.
But whether there is anything 'wrong' depends on what it's supposed to do.
If for example is was a test to see if a number was >= 8, then it would fail miserably on negative numbers.
The name 'new' certainly doesn't help.
thankyou for the reply.
but i am not sure whether this logic will work ( i.e to check whether the number is >=8) .. as lets say for eg +9 , the program still returns '0'
but i am not sure whether this logic will work ( i.e to check whether the number is >=8) .. as lets say for eg +9 , the program still returns '0'
•
•
Join Date: Dec 2005
Posts: 5,850
Reputation:
Solved Threads: 751
True.
So what's the indented function then?
If we don't know what it's supposed to do, how can we say whether it's right or wrong?
So what's the indented function then?
If we don't know what it's supposed to do, how can we say whether it's right or wrong?
even i was not sure. because in the test, i was supposed to tell what the function is intended to do and any potential problems !!!.
i could not exactly figure out this .. i.e why any pointers to this will be helpful.
as pointed out, i was also thinking whether it will cause any problems for -ve numbers .. but without any potential soln..
i could not exactly figure out this .. i.e why any pointers to this will be helpful.
as pointed out, i was also thinking whether it will cause any problems for -ve numbers .. but without any potential soln..
•
•
Join Date: Jul 2008
Posts: 20
Reputation:
Solved Threads: 0
Newbie Poster
This function resave number, if the number is 0 its return true else its return false.
The Boolean " a & 7 ;" says if a != 0 and 7 != 0 then 1 else 0
Has you see the 7 is not needed
The Boolean " a & 7 ;" says if a != 0 and 7 != 0 then 1 else 0
Has you see the 7 is not needed
This function resave number, if the number is 0 its return true else its return false.
The Boolean " a & 7 ;" says if a != 0 and 7 != 0 then 1 else 0
Has you see the 7 is not needed
--------------------------------
when the number is lets say '8'. it still returns '1' .. i.e basically numbers for which lsb 3 bits are not set. it will return '1'
The Boolean " a & 7 ;" says if a != 0 and 7 != 0 then 1 else 0
Has you see the 7 is not needed
--------------------------------
when the number is lets say '8'. it still returns '1' .. i.e basically numbers for which lsb 3 bits are not set. it will return '1'
|
Other Threads in the C Forum
- Previous Thread: Return values from functions
- Next Thread: Read from data file at some specified location
Views: 1581 | Replies: 23
| Thread Tools | Search this Thread |
Latest C Posts
- Today's Posts
- Unanswered Threads
Related Forum Features
Tag cloud for C
adobe ansi api array arrays asterisks binarysearch calculate centimeter char command convert copyimagefile copypdffile cprogramme creafecopyofanytypeoffileinc createcopyoffile csyntax directory dynamic executable fflush file fork forloop frequency getlasterror givemetehcodez graphics gtkgcurlcompiling hacking hardware highest homework i/o inches incrementoperators infiniteloop kernel km lazy linked linkedlist linux linuxsegmentationfault list lists locate logical_drives match matrix microsoft motherboard multi mysql number open opendocumentformat opensource owf pattern pdf performance pointer pointers posix problem probleminc program programming radix recursion recv repetition research scanf scheduling scripting segmentationfault send sequential shape socketprograming spoonfeeding stack standard string strings structures student systemcall testautomation turboc unix user variable voidmain() wab win32 windows.h
