Jared Burrows Blog: C

Showing posts with label C. Show all posts

Saturday, July 19, 2014

How to use the same C++ code for Android and iOS?

Best tutorial on using C++ code with iOS and Android

Please read this wonderful StackOverflow post:

http://stackoverflow.com/a/18334548/950427

Sunday, July 13, 2014

10 Rules for writing portable software!

I recently came across a good article about writing portable software with C/C++.

Brian's 10 rules for how to write cross platform software:

Don't port
Factor out the GUI
Use standard 'C' types
Use only built in #ifdef compiler flags
Develop cross-platform base libraries
Use UTF-8 for all APIs
Don't use 4rd party 'Application Frameworks'
Raw source builds on all platforms
All programmers compile on all platforms
Fire those that can't follow these rules

Source:

http://blog.backblaze.com/2008/12/15/10-rules-for-how-to-write-cross-platform-code/

Friday, December 16, 2011

How to use libcurl in C/C++

libcurl
Newer languages such as Java and newer scripting languages such as Python come with good libraries to download files and do online work. A good way to download files using C/C++ is to download and install the libcurl library.

First run 'curl-config --libs' to see if you have the library '-libcurl'
search for the package: 'apt-cache search libcurl'
install the package: 'sudo apt-get install libcurl4-nss-dev'
check to see if you have the package again

Next, go to http://curl.haxx.se/libcurl/c/simple.html. Copy and paste the code, save as 'simple.c' Change the "http://example.com" to something you want.

Compile your code: 'gcc simple.c -lcurl -o simple.out'
Run the code: './simple.out'

Output of (http://www.google.com/):

<html><head><meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>301 Moved</TITLE></HEAD><body>
<h1>
301 Moved</H1>
The document has moved
<a HREF="http://www.google.com/">here</A>.
</BODY></HTML>

http://curl.haxx.se/libcurl/c/simple.html

Friday, September 23, 2011

How to fix 'for' loop initial declarations are only allowed in C99 mode in Eclipse

For loop problem
Once again, programming in C using Eclipse in Linux is great, however when using "for" loops I get this error:

'for' loop initial declarations are only allowed in C99 mode

After a little bit of research, in Eclipse, go to Project > Properties > C/C++ Build > Settings > GCC C Compiler > Miscellaneous > add "-std=c99" to the "Linker Flags" text field.

http://www.eclipse.org/forums/index.php?t=msg&goto=212981&

How to fix undefined reference to `sqrt' in Eclipse

Math.h problem
Programming in C using Eclipse in Linux is great, however when i added variables that were doubles into the "sqrt" function from the "math.h" library there was a problem that came up.

undefined reference to `sqrt'

After a little bit of research, in Eclipse, go to Project > Properties > C/C++ Build > Settings > GCC C Linker > Miscellaneous > add "-lm" to the "Linker Flags" text field. That way it is properly linked to the project.

http://cboard.cprogramming.com/c-programming/88943-undefined-reference-sqrt.html

Monday, May 30, 2011

How to write HelloWorld in C?

HelloWorld.c

#include <stdio.h>
int main() {
  printf("Hello world!\n");
}