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App Inventor 2 进制转换与位运算教程 - 十六进制、二进制、补码、字节操作...
...转换
二、App Inventor 2 内置的进制相关积木块
2.1 基本数字块（Basic Number Block）
2.2 基数数字块（Radix Number Block）
2.3 convert number 积木块（进制转换核心）
2.4 format as decimal 积木块
三、常用进制转换方...
应用工具使用指导 · App Inventor 2 中文网
...先在应用市场上架）：
when 按钮_好评.Click() {
应用工具1.OpenAppMarket("")
}
案例二：打开微信，没装就提示
when 按钮_微信.Click() {
if 应用工具1.IsAppInstalled("com.tencent.mm") {
应用工具1.OpenApp("com.tencent.mm")
} els...
Make a Bash alias that takes a parameter?
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2193
Bash alias does not directly accept parameters. You will have to create a function.
alias doe...
How can I multiply and divide using only bit shifting and adding?
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14 Answers
14
Active
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FIND_IN_SET() vs IN()
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100
SELECT name
FROM orders,company
WHERE orderID = 1
AND companyID IN (attachedComp...
Uninstall old versions of Ruby gems
...# choose which ones you want to remove
gem uninstall rjb
# remove version 1.1.9 only
gem uninstall rjb --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall rjb --version '<1.3.4'
share
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How to get the name of the calling method?
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213
puts caller[0]
or perhaps...
puts caller[0][/`.*'/][1..-2]
...
How do I convert a TimeSpan to a formatted string? [duplicate]
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14 Answers
14
Active
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Length of generator output [duplicate]
...ou have a lazy infinite generator? For example:
def fib():
a, b = 0, 1
while True:
a, b = b, a + b
yield a
This never terminates but will generate the Fibonacci numbers. You can get as many Fibonacci numbers as you want by calling next().
If you really need to know the ...