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How do I use extern to share variables between source files?
...er links unless you override the
default with -fcommon (or use attributes, etc — see the link).
The next two files complete the source for prog2:
prog2.h
extern void dec(void);
extern void put(void);
extern void inc(void);
prog2.c
#include "prog2.h"
#include <stdio.h>
int main(void)
{
...
Freely convert between List and IEnumerable
...(y), selector(x)));
}
Then you can use:
list.Sort(x=>x.SomeProp); // etc
This updates the existing list in the same way that List<T>.Sort usually does.
share
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improve this answer
...
Return array in a function
...rgv[]){
int arr[] = { 1,2,3,4,5 };
// arr[0] == 1
// arr[1] == 2 etc
int result = fillarr(arr);
// arr[0] == 10
// arr[1] == 5
return 0;
}
I suggest you might want to consider putting a length into your fillarr function like
this.
int * fillarr(int arr[], int length)
T...
What does -save-dev mean in npm install grunt --save-dev
...uch modules should only be needed when developing the app (eg grunt, mocha etc).
According to the package.json docs
Edit: Attempt at visualising what npm install does:
yourproject
dependency installed
dependency installed
dependency installed
devDependency NOT installed
devDependency NOT ...
Difference between malloc and calloc?
...e client process. This works same way memory mapped files, virtual memory, etc. work.. it uses paging.
Here is one optimization story about the topic:
http://blogs.fau.de/hager/2007/05/08/benchmarking-fun-with-calloc-and-zero-pages/
...
HttpURLConnection timeout settings
...
HttpURLConnection has a setConnectTimeout method.
Just set the timeout to 5000 milliseconds, and then catch java.net.SocketTimeoutException
Your code should look something like this:
try {
HttpURLConnection.setFollowRedirects(false);
HttpU...
How do I start a program with arguments when debugging?
... {
Console.SetOut(sw); // this makes any Console.Writes etc go to sw
Program.Main(new[] { "argument" });
var result = sw.ToString();
Assert.AreEqual("expected", result);
}
}
}
This way you can, in an automated way, test multiple...
How to open every file in a folder?
...rent directory using os.listdir:
import os
for filename in os.listdir(os.getcwd()):
with open(os.path.join(os.cwd(), filename), 'r') as f: # open in readonly mode
# do your stuff
Glob
Or you can list only some files, depending on the file pattern using the glob module:
import glob
for ...
Current time formatting with Javascript
...d you will see that you can extract all the bits (date, month, year, hour, etc).
http://www.w3schools.com/jsref/jsref_obj_date.asp
For something like Fri 23:00 1 Feb 2013 the code is like:
date = new Date();
weekdayNames = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
monthNames = ["...
Why is #!/usr/bin/env bash superior to #!/bin/bash?
...h_installed_on_this_system="$(\
awk -F'/' '$NF == "bash"{print}' "/etc/shells"\
)"
for bash in $all_bash_installed_on_this_system
do
versinfo="$( $bash -c 'echo ${BASH_VERSINFO}' )"
[ "${versinfo}" -eq "${DESIRED_VERSION}" ] && { found=1 ; break;}
...