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What is the printf format specifier for bool?
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There is no format specifier for bool types. However, since any integral type shorter than int is promoted to int when passed down to printf()'s variadic arguments, you can use %d:
bool x = true;
printf("%d\n", x); // prints 1
But why not:
printf(x ? "true" : "false");
or, better:
prin...
What does collation mean?
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Collation can be simply thought of as sort order.
In English (and it's strange cousin, American), collation may be a pretty simple matter consisting of ordering by the ASCII code.
Once you get into those strange European languages with all their accen...
Generate a heatmap in MatPlotLib using a scatter data set
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If you don't want hexagons, you can use numpy's histogram2d function:
import numpy as np
import numpy.random
import matplotlib.pyplot as plt
# Generate some test data
x = np.random.randn(8873)
y = np.random.randn(8873)
heatmap, xedges, yedges =...
How to check whether a string is a valid HTTP URL?
There are the Uri.IsWellFormedUriString and Uri.TryCreate methods, but they seem to return true for file paths etc.
9...
In git how is fetch different than pull and how is merge different than rebase?
I just cant understand this. I been reading a lot on the web and books and something is just not staying in my head. Can someone please give me the dummy version of the following:
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Making macOS Installer Packages which are Developer ID ready
Note: This is for OS X Installer packages only, packages for submission to the Mac App Store follow different rules.
5 ...
How to calculate the number of occurrence of a given character in each row of a column of strings?
I have a data.frame in which certain variables contain a text string. I wish to count the number of occurrences of a given character in each individual string.
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C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...户端Linux下select函数实现的聊天服务器消息缓冲区类MessageBuffer，接收线程将受到的消息放入缓冲区，发送线程从缓冲区中取出消息MessageBuffe...目录：
Linux下select函数实现的聊天服务器
基于WSAAsyncSelect模型实现的聊天室图形客户...
android: move a view on touch move (ACTION_MOVE)
...a container with a view inside. If I touch the container and I move the finger, I want to move the view to follow my finger.
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MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...rl-DBI perl-DBD-MySQL perl-TermReadKey perl-Time-HiRes #安装工具 # wget percona.com/get/percona-toolkit.tar.gz # tar zxvf percona-toolkit-2.2.14.tar.gz # cd percona-toolkit-2.2.14 # perl Makefile.PL && make && make install
校验数据一致性
建立用户并授权
注意这里要在主...