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App Inventor 2 数学代码块 · App Inventor 2 中文网
...andom set seed to)
最小值 (min)
最大值 (max)
平方根 (square root)
绝对值 (abs)
相反数 (neg)
对数 (log)
e^
四舍五入 (round)
上取整 (ceiling)
下取整 (floor)
求模 (modulo)
余数 (remainder)
商 (quotient)
正弦 (sin)
余弦 (cos)
正切 (ta...
Makefiles with source files in different directories
... allowing you to build them independently. Further, have a Makefile in the root directory of the project which builds everything. The "root" Makefile would look something like the following:
all:
+$(MAKE) -C part1
+$(MAKE) -C part2
+$(MAKE) -C part3
Since each line in a make target ...
Importing a Maven project into Eclipse from Git
...cry in frustration. As far as I know, if the cloned repository lies on the root of your Eclipse workspace, and your Maven project file hierarchy has a POM on its root, then importing such root project will rename the cloned folder (with the template you chose, defaults to [artifactId]). Without chan...
Controlling a USB power supply (on/off) with Linux
...n foo using sudo. The redirection fails because it happens before you get root access. The solution is to use sudo sh -c 'echo disabled > /sys/bus/usb/devices/usb1/power/wakeup', and so on: gain root, run a new hell to perform a redirect, then output something into the redirected file descripto...
What's the purpose of META-INF?
...clude with your JAR should be placed in some other sub-directory or at the root of the JAR itself.
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...int类型在内存中所占字节数）。为了知道static_cast<> 实际如何，我们不得不要来看一下CDerived的内存布局。
CDerived的内存布局（Memory Layout）
如图所示，CDerived的内存布局包括两个对象，CBaseX 和 CBaseY，编译器也知道这一点...
What are some compelling use cases for dependent method types?
...unless you subsume to their common supertype, because Scala doesn't have a union (disjunction) type. See my Q&A on subsumption in Scala.
– Shelby Moore III
May 19 '12 at 0:26
...
Total memory used by Python process?
...nt sum " KB"}'
90064 KB
Attach my process list.
$ ps aux | grep python
root 943 0.0 0.1 53252 9524 ? Ss Aug19 52:01 /usr/bin/python /usr/local/bin/beaver -c /etc/beaver/beaver.conf -l /var/log/beaver.log -P /var/run/beaver.pid
root 950 0.6 0.4 299680 34220 ? Sl...
Find all storage devices attached to a Linux machine [closed]
...setups such as EC2 xvda devices.
Here is a dump for a m1.large instance:
root@ip-10-126-247-82:~# fdisk -l
Disk /dev/xvda1: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 byt...
Allowed characters in Linux environment variable names
...n/sh}
Verify environment variables:
HOSTNAME=bd0bccfdc53b
SHLVL=2
HOME=/root
spring.application_name=happy-variable-name
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
Use ps aux to verify PID not changed
PID USER TIME COMMAND
1 root 0:00 /bi...