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by: MiniDisc_2k2 |
last post by:
Okay, here's a question about the standard. What does it say about
unsigned/signed mismatches in a comparison statement:
char a = 3;
unsigned char b = 255;
if (a<b)
Now what's the real answer here? If a is converted to unsigned, then b>a.
But, if b is converted to signed,then a>b. What's the correct coversion
(what is the compiler supposed to do?)
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by: Siemel Naran |
last post by:
Hi. Is there a way to convert the type signed int to the type unsigned int,
char to unsigned char, signed char to unsigned char, and so on for all the
fundamental integer types? Something like
template <>
struct to_unsigned<signed int> : public std::unary_function<signed int,
unsigned int>
{
unsigned int operator()(signed int x) const { return x; }
};
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by: Fred Ma |
last post by:
Hello,
I've been trying to clear up a confusion about
integer promotions during expression evaluation.
I've checked the C FAQ and C++ FAQ (they are
different languages, but I was hoping one would
clear up the confusion), as well as googling
groups and the web.
The confusion is that for a binary operator,
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by: dam_fool_2003 |
last post by:
For int data type the default range starts from signed to unsigned. If
we don't want negative value we can force an unsigned value. The same
goes for long also.
But I don't understand why we have signed char which is -256. Does it
means that we can assign the same ASCII value to both signed and
unsigned. That means the ASCII value can be represented with a type of
signed char and also unsigned char?
For example
int main(void)
{
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by: tinesan |
last post by:
Hello fellow C programmers,
I'm just learning to program with C, and I'm wondering what the
difference between signed and unsigned char is. To me there seems to
be no difference, and the standard doesn't even care what a normal char
is (because signed and unsigned have equal behavior).
For example if someone does this:
unsigned char a = -2; /* or = 254 */
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by: Hanzac Chen |
last post by:
Hi,
I don't understand why this could happen?
The Code 1 will output `fff9'
and the Code 2 will output `1'
How could the `mod 8' not have effect?
/* Code 1 */
#include <stdio.h>
#include <stdlib.h>
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by: =?iso-8859-2?B?SmFuIFJpbmdvuQ==?= |
last post by:
Hello everybody,
this is my first post to a newsgroup at all.
I would like to get some feedback on one proposal I am thinking about:
--- begin of proposal ---
Proposal to add
signed/unsigned modifier to class declarations
to next revision of C++ programming language
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by: somenath |
last post by:
Hi All,
I am trying to undestand "Type Conversions" from K&R book.I am not
able to understand the
bellow mentioned text
"Conversion rules are more complicated when unsigned operands are
involved. The problem
is that comparisons between signed and unsigned values are machine-
dependent, because
they depend on the sizes of the various integer types. For example,
suppose that int is 16 bits
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by: Kislay |
last post by:
Consider the following code snippet
unsigned int i=10;
int j= - 2; // minus 2
if(i>j)
cout<<"i is greater";
else
cout<<"j is greater";
Since i is unsigned , j is greater . I know why , but vaguely . Can
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by: Juha Nieminen |
last post by:
I was once taught that if some integral value can never have negative
values, it's a good style to use an 'unsigned' type for that: It's
informative, self-documenting, and you are not wasting half of the value
range for values which you will never be using.
I agreed with this, and started to always use 'unsigned' whenever
negative values wouldn't make any sense. I did this for years.
However, I slowly changed my mind: Doing this often...
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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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 effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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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, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
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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 Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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