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micro:bit 微控制器教程 · App Inventor 2 中文网
...signer 页面设置
积木编程
步骤1：蓝牙初始化
步骤2：设备选择
步骤3：读取温度传感器
步骤4：发送控制指令
micro:bit 端设置
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Is the primary key automatically indexed in MySQL?
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edited Dec 3 '11 at 20:41
answered Jul 1 '09 at 20:24
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How to find out what character key is pressed?
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159
"Clear" JavaScript:
<script type="text/javascript">
function myKeyPress(e){
var k...
What's the difference between `raw_input()` and `input()` in Python 3?
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edited Apr 4 at 19:34
answered Feb 6 '11 at 18:53
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Is it possible to make a type only movable and not copyable?
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165
Preface: This answer was written before opt-in built-in traits—specifically the Copy aspects...
Breaking out of a nested loop
...urn to exit back to the main code.
// goto
for (int i = 0; i < 100; i++)
{
for (int j = 0; j < 100; j++)
{
goto Foo; // yeuck!
}
}
Foo:
Console.WriteLine("Hi");
vs:
// anon-method
Action work = delegate
{
for (int x = 0; x < 10...
Is effective C++ still effective?
...al functions? Factor parameter-independent code out of
templates? (Items 13, 22, 35, and 44.) Yes, yes, yes, yes! My goal has
always been for Effective C++'s table of contents to summarize the
advice in the book, and that summary remains just as applicable to
C++0x development as to “tradi...
How to negate the whole regex?
I have a regex, for example (ma|(t){1}) . It matches ma and t and doesn't match bla .
4 Answers
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“unary operator expected” error in Bash if condition
...pathname expansion are not applied to words, so you can rely on
if [[ $aug1 == "and" ]];
to compare the value of $aug1 with the string and.
If you use [ ... ], you always need to remember to double quote variables like this:
if [ "$aug1" = "and" ];
If you don't quote the variable expansion an...