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How to correctly use the extern keyword in C
...xample of a use of extern.
Example 1 - to show a pitfall:
File stdio.h:
int errno;
/* other stuff...*/
myCFile1.c:
#include <stdio.h>
Code...
myCFile2.c:
#include <stdio.h>
Code...
If myCFile1.o and myCFile2.o are linked, each of the c files have separate copies of errno. ...
How to define an enumerated type (enum) in C?
...
It's worth pointing out that you don't need a typedef. You can just do it like the following
enum strategy { RANDOM, IMMEDIATE, SEARCH };
enum strategy my_strategy = IMMEDIATE;
It's a style question whether you prefer typedef. Without ...
What does the restrict keyword mean in C++?
...Not in C++ standard yet, but supported by many C++ compilers
! A hint only, so may do nothing and still be conforming
A restrict-qualified pointer (or reference)...
! ...is basically a
promise to the compiler that for the
scope of the pointer, the target of the pointe...
Height of status bar in Android [duplicate]
...etWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectangle);
int statusBarHeight = rectangle.top;
int contentViewTop =
window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
int titleBarHeight= contentViewTop - statusBarHeight;
Log.i("*** Elenasys :: ", "StatusBar Height= " ...
C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...把代码列在下面：#include <stdio.h>
struct str{
int len;
char s[0];
};
struct foo {
struct str *a;
};
int main(int argc, char** argv) {
struct foo f={0};
if (f.a->s) {
prin...
What tools are there for functional programming in C?
...n C -- callback = alloc_callback(&function, data) returns a function pointer such that callback(arg1, ...) is equivalent to calling function(data, arg1, ...). You will have to handle garbage collection manually, though.
Relatedly, blocks have been added to Apple's fork of GCC; they're not func...
Creating a ZIP Archive in Memory Using System.IO.Compression
...
Thanks! i just added the line of code to convert bytes to zip file
– Elnoor
Sep 20 '17 at 21:30
...
Set margins in a LinearLayout programmatically
...ons in Android, they take pixels. I suggest a global utility function that converts dips to px. This is what I have done in all my apps. Android API sucks.
– mxcl
Jan 26 '12 at 12:00
...
Can I use view pager with views (not with fragments)
... getItem():
@Override
public Object instantiateItem(ViewGroup collection, int position) {
View v = layoutInflater.inflate(...);
...
collection.addView(v,0);
return v;
}
@Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((V...
Selecting/excluding sets of columns in pandas [duplicate]
...
You don't really need to convert that into a set:
cols = [col for col in df.columns if col not in ['B', 'D']]
df2 = df[cols]
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