473,396 Members | 1,707 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,396 software developers and data experts.

simple question

I was wondering why the following code causes an infinite loop when i type
in an alphabetic character?

while (bool == 0)
{
if(scanf("%d", &subjectDuration) == 1)
{
if(subjectDuration > 26 || subjectDuration < 0)
{
printf("The number of weeks is invalid,");
printf("please try again.\n");
}
else
bool = 1;
}
else
{
printf("You have entered an invalid character,");
printf("please try again.\n");
}
}
Nov 13 '05 #1
4 3548
"Tony Jo" <to*****@bigpond.com> wrote in message
news:pK*******************@news-server.bigpond.net.au...

I was wondering why the following code causes an infinite loop when i type
in an alphabetic character?

while (bool == 0)
{
if(scanf("%d", &subjectDuration) == 1)
{ [ . . . ] }
else
{
printf("You have entered an invalid character,");
printf("please try again.\n");
}
}


This is addressed in the FAQ:

http://www.eskimo.com/~scs/C-faq/q12.19.html

See also

http://www.comeaucomputing.com/techtalk/#flushinput

Regards,

Russell Hanneken
rh*******@pobox.com
Nov 13 '05 #2

"Russell Hanneken" <rh*******@pobox.com> wrote in message
news:BZ***************@newsread3.news.pas.earthlin k.net...
"Tony Jo" <to*****@bigpond.com> wrote in message
news:pK*******************@news-server.bigpond.net.au...

I was wondering why the following code causes an infinite loop when i type in an alphabetic character?

while (bool == 0)
{
if(scanf("%d", &subjectDuration) == 1)
{

[ . . . ]
}
else
{
printf("You have entered an invalid character,");
printf("please try again.\n");
}
}


This is addressed in the FAQ:

http://www.eskimo.com/~scs/C-faq/q12.19.html

See also

http://www.comeaucomputing.com/techtalk/#flushinput

Regards,

Russell Hanneken
rh*******@pobox.com


Thanks. I totally forgot about that. I've been at my assignment for so long
I totally forgot about clearing the buffer
Nov 13 '05 #3
Russell Hanneken wrote:
"Tony Jo" <to*****@bigpond.com> wrote in message
news:pK*******************@news-server.bigpond.net.au...

I was wondering why the following code causes an infinite loop when
i type in an alphabetic character?

while (bool == 0)
{
if(scanf("%d", &subjectDuration) == 1)
{

[ . . . ]
}
else
{
printf("You have entered an invalid character,");
printf("please try again.\n");
}
}


This is addressed in the FAQ:

http://www.eskimo.com/~scs/C-faq/q12.19.html

See also

http://www.comeaucomputing.com/techtalk/#flushinput

Regards,

Russell Hanneken
rh*******@pobox.com

http://www.eskimo.com/~scs/C-faq/q12.19.html

i can't connect the above.. nor www.eskimo.com

is the url valid ?
Nov 13 '05 #4
herrcho wrote:
http://www.eskimo.com/~scs/C-faq/q12.19.html

i can't connect the above.. nor www.eskimo.com
No problems here.

is the url valid ?


Yes, it's fine. Why not re-try?

--
Richard Heathfield : bi****@eton.powernet.co.uk
"Usenet is a strange place." - Dennis M Ritchie, 29 July 1999.
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
K&R answers, C books, etc: http://users.powernet.co.uk/eton
Nov 13 '05 #5

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

3
by: Patchwork | last post by:
Hi Everyone, Please take a look at the following (simple and fun) program: //////////////////////////////////////////////////////////////////////////// ///////////// // Monster Munch, example...
1
by: Proteus | last post by:
Any help appreciated on a small perl project I need to write for educator/teaching purposes. I have not programmed perl for some time, need to get up to speed, maybe some kind souls hrere will help...
2
by: Raskolnikow | last post by:
Hi! I have a very simple problem with itoa() or the localtime(...). Sorry, if it is too simple, I don't have a proper example. Please have a look at the comments. struct tm *systime; time_t...
3
by: Peter | last post by:
Hello Thanks for reviewing my question. I would like to know how can I programmatically select a node Thanks in Advanc Peter
7
by: abcd | last post by:
I am trying to set up client machine and investigatging which .net components are missing to run aspx page. I have a simple aspx page which just has "hello world" printed.... When I request...
4
by: dba_222 | last post by:
Dear Experts, Ok, I hate to ask such a seemingly dumb question, but I've already spent far too much time on this. More that I would care to admit. In Sql server, how do I simply change a...
14
by: Giancarlo Berenz | last post by:
Hi: Recently i write this code: class Simple { private: int value; public: int GiveMeARandom(void);
30
by: galiorenye | last post by:
Hi, Given this code: A** ppA = new A*; A *pA = NULL; for(int i = 0; i < 10; ++i) { pA = ppA; //do something with pA
10
by: Phillip Taylor | last post by:
Hi guys, I'm looking to develop a simple web service in VB.NET but I'm having some trivial issues. In Visual Studio I create a web services project and change the asmx.vb file to this: Imports...
17
by: Chris M. Thomasson | last post by:
I use the following technique in all of my C++ projects; here is the example code with error checking omitted for brevity: _________________________________________________________________ /*...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.