question about static variables and extern in plain C

Posted by user324994 on Stack Overflow See other posts from Stack Overflow or by user324994
Published on 2010-05-06T03:44:40Z Indexed on 2010/05/06 3:48 UTC
Read the original article Hit count: 219

Filed under:

extern

|

static

Is there a difference between declaring a static variable outside of a function and declaring a static variable inside a function?

Also, what's the difference between declaring a variable as static and just declaring an extern variable?

© Stack Overflow or respective owner

Related posts about extern

How does an "extern C" declaration work?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm taking a programming languages course and we're talking about the "extern C" declaration. How does this declaration work at a deeper level other than "it interfaces C and C++"? How does this affect the bindings that take place in the program as well? >>> More
Problem with extern keyword in C++

as seen on Stack Overflow - Search for 'Stack Overflow'
What's the difference between the following two declarations? I thought they were equivalent, but the first sample works, and the second does not. I mean it compiles and runs, but the bitmap display code shows blank. I have not stepped through it yet, but am I missing something obvious? GUI_BITMAP… >>> More
extern "C" has no effect in msvc++ 9.0

as seen on Stack Overflow - Search for 'Stack Overflow'
I manage project for JNI for both compilers: MSVC++ 8.0 and 9.0, my cpp file contains following implementation: extern "C" { JNIEXPORT jlong JNICALL Java_context_ServiceProviderContext_StartServiceProvider (JNIEnv * env, jclass, jstring jspath){ ..... } With help of depends.exe… >>> More
How does extern work in c++?

as seen on Stack Overflow - Search for 'Stack Overflow'
This is from the <iostream>: namespace std { extern istream cin; ///< Linked to standard input extern ostream cout; ... It seems by using extern the data types defined in other namespaces will just be available? >>> More
The extern alias 'xxx' was not specified in a /reference option

as seen on Stack Overflow - Search for 'Stack Overflow'
I have two assemblies that unfortunately define the same type in the same namespace. I'm trying to use a an extern alias to work around the problem. In the Visual Studio IDE I have set the "Aliases" property of the reference to my alias. This is supposed to change the C# compiler command line to… >>> More

Related posts about static

.htaccess to block by file name possible?

as seen on Server Fault - Search for 'Server Fault'
I have a bunch of files that are secure_xxxxxx.php. Is there a way to use .htaccess to block access to all the secure_* php files based on IP? EDIT: I've tried but I get 500 errors <FilesMatch "^secure_.*\.php$"> order deny all deny from all allow from my ip here </FilesMatch> Don't… >>> More
Java: static-non-static-this problem

as seen on Stack Overflow - Search for 'Stack Overflow'
$ javac TestFilter.java TestFilter.java:19: non-static variable this cannot be referenced from a static context for(File f : file.listFiles(this.filterFiles)){ ^ 1 error $ sed -i 's@this@TestFilter@g' TestFilter.java $ javac TestFilter.java $ java TestFilter file1 file2 file3 TestFilter… >>> More
C# - Get values of static properties from static class

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to loop through some static properties in a simple static class in order to populate a combo box with their values, but am having difficulties. Here is the simple class: public static MyStaticClass() { public static string property1 = "NumberOne"; public static string property2… >>> More
Closest Ruby representation of a 'private static final' and 'public static final' class variable in

as seen on Stack Overflow - Search for 'Stack Overflow'
Given the Java code below, what's the closest you could represent these two static final variables in a Ruby class? And, is it possible in Ruby to distinguish between private static and public static variables as there is in Java? public class DeviceController { ... private static final Device… >>> More
non-static variable cannot be referenced from a static context (java)

as seen on Stack Overflow - Search for 'Stack Overflow'
I ask that you ignore all logic.. i was taught poorly at first and so i still dont understand everything about static crap and its killing me. My error is with every single variable that i declare then try to use later inside my methods... i get the non-static variable cannot~~ error I can simply… >>> More