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App Inventor 2 列表代码块 · App Inventor 2 中文网
...对元素。
例如，如果列表为 [[a,apple], [d,Dragon], [,boxcar], [cat,100]]，则查找 b 将返回 boxcar。
如果列表中没有这样的对，则 在键值对中查找 将返回未找到参数。 如果 键值对 不是列表对，则操作将发出错误信号。
分隔符拼接成...
Is there a simple way to convert C++ enum to string?
...ngled="_Z3std"/>
<Enumeration id="_3" name="MyEnum" context="_1" location="f0:1" file="f0" line="1">
<EnumValue name="FOO" init="0"/>
<EnumValue name="BAR" init="80"/>
</Enumeration>
<File id="f0" name="my_enum.h"/>
</GCC_XML>
You could use any ...
Find current directory and file's directory [duplicate]
...e__ attribute can help you find out where the file you are executing is located. This SO post explains everything: How do I get the path of the current executed file in Python?
share
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improve th...
R command for setting working directory to source file location in Rstudio
...
To get the location of a script being sourced, you can use utils::getSrcDirectory or utils::getSrcFilename. So changing the working directory to that of the current file can be done with:
setwd(getSrcDirectory()[1])
This does not work...
How to create dictionary and add key–value pairs dynamically?
...
I am using JSON.stringify on this object and then catching it with a controller in MVC 3. This is just so that it is formatted properly before stringifying it and sending it along.
– KenEucker
Aug 25 '11 at 21:09
...
What text editor is available in Heroku bash shell? [closed]
...nload the git repo .... over HTTPS without a commit hash - possible certificate error?'
– Tim Malone
Jun 27 '17 at 6:28
3
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In C, how should I read a text file and print all strings
...d.
If you want to read the file in chunks, but without dynamic memory allocation, you can do:
#define CHUNK 1024 /* read 1024 bytes at a time */
char buf[CHUNK];
FILE *file;
size_t nread;
file = fopen("test.txt", "r");
if (file) {
while ((nread = fread(buf, 1, sizeof buf, file)) > 0)
...
How do I make python wait for a pressed key?
... While this is my favorite of the answers here, like the others doesn't catch things like shift, control, etc
– Mala
Mar 3 '13 at 20:22
...
git: diff between file in local repo and origin
...ike this (you are in the local folder):
#!/bin/bash
git fetch
var_local=`cat .git/refs/heads/master`
var_remote=`git log origin/master -1 | head -n1 | cut -d" " -f2`
if [ "$var_remote" = "$var_local" ]; then
echo "Strings are equal." #1
else
echo "Strings are not equal." #0 if you want
fi...
How to achieve code folding effects in Emacs?
...
Another way to skin the cat:
As it happens, you don’t need any package or extra configuration for
that. Just go to any source file, type
M-1 C-x $ and magic happens!
As usual, it’s white magic: C-x $ will bring your code back.
We c...