What does >and << do?
Googling on them and they are just ignored...
2  1269 
On Fri, Aug 22, 2008 at 6:30 PM, defn noob <ci**********@y ahoo.sewrote:
What does >and << do?
Normally they are bitwise operators:
>Shifts bits right
<< Shifts bits left
print 1 << 3
8
because 8 = 00001000 in binary
Regards
On Aug 22, 5:43*pm, "Medardo Rodriguez (Merchise Group)"
<med....@gmail. comwrote:
On Fri, Aug 22, 2008 at 6:30 PM, defn noob <circularf...@y ahoo.sewrote:
What does >and << do?
Normally they are bitwise operators:>Shif ts bits right
<< Shifts bits left
print 1 << 3
8
because 8 = 00001000 in binary
Regards
An example of usage:
import gmpy
def Collatz(n):
#
# if n is odd, multiply by 3 and add 1
# if n is even, divide by 2 until n becomes odd
# repeat until n == 1
#
while n>1:
print n,
f = gmpy.scan1(n) # find position of first 1-bit
if f>0: # it's even, so...
n = n >f # ...remove factors of 2 in one fell swoop
else: # it's odd
n = 3*n + 1
print n
print 'Collatz(11):',
Collatz(11)
print
print 'Collatz(27):',
Collatz(27)
## Collatz(11): 11 34 17 52 13 40 5 16 1
##
## Collatz(27): 27 82 41 124 31 94 47 142 71
## 214 107 322 161 484 121 364
## 91 274 137 412 103 310 155
## 466 233 700 175 526 263 790
## 395 1186 593 1780 445 1336
## 167 502 251 754 377 1132 283
## 850 425 1276 319 958 479 1438
## 719 2158 1079 3238 1619 4858
## 2429 7288 911 2734 1367 4102
## 2051 6154 3077 9232 577 1732
## 433 1300 325 976 61 184 23 70
## 35 106 53 160 5 16 1 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Pedro Werneck |
last post by:
Hi list
I'm trying to implement a new type in a C extension and it must support
some binary operators, like &, |, ^, << and >>. With &, | and ^, the
method must receive another object of the same type, perform the
operation with an attribute of both, create a new object with the result
as the attribute and return it.
Everything works perfectly with &, | and ^, but with << and >> I need
|
by: PengYu.UT |
last post by:
I heard that != >= > <= operators are defined based on the operator ==
<.
Could you tell me which header file defines the four operators?
Best wishes,
Peng
|
by: Peter Bromley |
last post by:
The following code snippet does not seem to work correcly
unsigned __int64 result = 0xFFFFFFFFFFFFFFFF;
result = result << 64;
Debugger.WriteLine(System::String::Format(S"{0:X16}", __box(result));
result = 0xFFFFFFFFFFFFFFFF;
result = result >> 64;
Debugger.WriteLine(System::String::Format(S"{0:X16}", __box(result));
__int64 result = -1;
|
by: Rocky Moore |
last post by:
I have a web site called HintsAndTips.com. On this site people post tips
using a very simply webform with a multi line TextBox for inputing the tip
text. This text is encode to HTML so that no tags will remain making the
page safe (I have to convert the linefeeds to <BR>s because the
Server.EncodeHTML does not do that it seems).
The problem is that users can use a special tag when editing the top to
specify an area of the tip that will...
|
by: jelle |
last post by:
Hi,
I use python quite a bit to couple different programs together.
Doing so has been a _lot_ easier since subprocess came around, but
would really like to be able to use the succinct shell syntax; >, <, |
That really shouldn't be too hard to wrap in a class, but so far I
didn't succeed to do so this well, since I'm facing some trouble with
operator precedence that I do not know how to overcome.
| | |
by: Suman |
last post by:
Having had a look at the C++ FAQ, comp.lang.c++ & comp.std.c++
archives and Stroustrup's FAQs (particularly the following:
<url:http://www.research.att.com/~bs/bs_faq2.html#overload-dot/>)
I am left to wondering why Stroustrup doesn't mention the
*_cast<> operators or operator .* in that particular FAQ.
Archived discussions have convinced me that .* _cannot_ be overloaded.
I have gathered a notion (perhaps incorrectly) that the *_cast<>...
|
by: onkar |
last post by:
#include<stdio.h>
int main(void){
printf("%d %d\n",32<<1,32<<0);
printf("%d %d\n",32<<-1,32<<-0);
<----------------------------------see here
printf("%d %d\n",32>>1,32>>0);
printf("%d %d\n",32>>-1,32>>-0);
<----------------------------------and here
return 0;
|
by: =?Utf-8?B?QmVu?= |
last post by:
Hi,
I'm trying to figure out the purpose of these operators.
Now, I know what they do. They shift bits either left or right.
But I don't know why would anybody want to do that. I've never seen
anyone using it in his/her code.
Any ideas?
Thanks,
Ben
|
by: Michael |
last post by:
Since the include function is called from within a PHP script, why
does the included file have to identify itself as a PHP again by
enclosing its code in <?php... <?>
One would assume that the PHP interpreter works like any other, that
is, it first expands all the include files, and then parses the
resulting text. Can anyone help with an explanation?
Thanks,
M. McDonnell
|
by: Nathan Sokalski |
last post by:
Something that I recently noticed in IE6 (I don't know whether it is true
for other browsers or versions of IE) is that it renders <br/and <br></br>
differently. With the <br/version, which is what most people use when they
write static code (some people use <br>, but with xhtml you are required to
close all tags), IE6 simply breaks to the next line like it is supposed to.
However, with <br></br>, which is what is sometimes generated by...
|
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...
| | |
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,...
|
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...
|
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,...
|
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 protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
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...
| | |
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
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...
| |
