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2. How do I use extern to share variables between source files?

   stackoverflow.com/questions/1433204

   file4c.c which simply uses the global variables. file5c.c which shows that you can declare and then define the global variables. file6c.c which shows that you can define and then (attempt to) declare the global variables. In these examples, file5c.c and file6c.c directly include the header file2c.h several times, but that is the simplest way to ...

3. syntax - What does "static" mean in C? - Stack Overflow

   stackoverflow.com/questions/572547

   In the C programming language, static is used with global variables and functions to set their scope to the containing file. In local variables, static is used to store the variable in the statically allocated memory instead of the automatically allocated memory.

4. Why declare a variable or function static in C? - Stack Overflow

   stackoverflow.com/questions/1665250

   Variables can also be declared static inside a function. This feature means the variable is not automatic, i.e. allocated and freed on the stack with each invocation of the function. Instead the variable is allocated in the static data area, it is initialized to zero and persists for the life of the program.

5. How to undeclare (delete) a variable in C? - Stack Overflow

   stackoverflow.com/questions/45387465

   The total amount of memory occupied by such variables is extremely small, because it is a direct function of how many variables you, as a programmer, can declare by hand-typing their declarations. It would take years of typing on a keyboard, doing nothing but mindlessly declaring variables, before you would declare a number of int variables ...

6. How do I return multiple values from a function in C?

   stackoverflow.com/questions/2620146

   Depending on what you're doing (OP never clarified if this is actually a C question), allocation might be a concern, but it usually isn't in C++ land (return value optimization saves all of this) and in C land, data copies usually happen explicitly (via strncpy or whatever). –

7. initialization - Initializing variables in C - Stack Overflow

   stackoverflow.com/questions/7975008

   Static and global variables will be initialized to zero for you so you may skip initialization. Automatic variables (e.g. non-static variables defined in function body) may contain garbage and should probably always be initialized. If there is a non-zero specific value you need at initialization then you should always initialize explicitly.

8. How to correctly use the extern keyword in C - Stack Overflow

   stackoverflow.com/questions/496448

   myCFile1.c: #include <stdio.h> // Code using errno... myCFile2.c: #include <stdio.h> // Code using errno... If myCFile1.o and myCFile2.o are linked, each of the c files have separate copies of errno. This is a problem as the same errno is supposed to be available in all linked files. Example 2 - The fix. stdio.h: extern int errno; stdio.c: int ...

9. Where in memory are my variables stored in C? - Stack Overflow

   stackoverflow.com/questions/14588767

   Local variables (also called as automatic variables in C) Global variables; Static variables; You can have global static or local static variables, but the above three are the parent types. 5 Memory Segments in C: 1. Code Segment. The code segment, also referred as the text segment, is the area of memory which contains the frequently executed code.

10. How do I share variables between different .c files?

    stackoverflow.com/questions/1045501

    Those other variables would have to be declared public (use extern, public is for C++), and you would have to include that .c file. However, I recommend creating appropriate .h files to define all of your variables. For example, for hello.c, you would have a hello.h, and hello.h would store your variable definitions.

11. Passing and returning variables in C - Stack Overflow

    stackoverflow.com/questions/5130978

    Declare A, B and C as global variables: int A, B, C; int FuncA(void); int FuncB(int A, int B, int C); .... and access them from any function, whether parameters or not. Or declare them static globals to limit the possible damage of global scoping.