nul in void

The use of Android fragment 1. Use Support Library If your application needs to run in versions 3.0 and above, you can ignore this part of the content. If your application uses a version below 3.0, 1.6, or more, you need to use a support library to

For FragmentManager findFragmentById, return nul, findfragmentbyid First, let's look at the two generation methods of Fragment. 1. Generate with xml tags Add an xml tag to the fragment's host activity. 1 The fragment class created by name for

0Is an integer constant, '\ 0'Is a character constant, NulIs the name of the character constant. NULLIs a macro defined in several standard headers, All of these are ** not * interchangeable: NULL is to be used for pointers only since it may be

NullIs a macro defined as a null pointer in the header file . Nul is the name of the first character in the ASCII character set. It corresponds to a zero value. The C language does not contain predefined macros such as NUL. Note: In the ASCII

This article and we share the main is the C language null pointer null and void pointers related content, together look at it, hope to learn C language to help you.empty pointer nullA pointer variable can point to any piece of memory on the computer,

Empty pointer nullin the C language, if a pointer does not point to any data, we call itNULL pointer, withNULLrepresentation. For example:int *p = NULL; note Case-sensitive, NULL does not have any special meaning, just an ordinary identifier.

/*File: String. h# Ifndef _ linux_string_h _# DEFINE _ linux_string_h _ /* We don't want strings. h stuff being user by user stuff by accident */ # Ifdef _ KERNEL __ # Include /* For size_t */# Include /* For null */# Include /* for inline

How to get a summary of dates and times in C + +:Starting with the introduction of the basic concept, this paper discusses the data structure and function used in the C + + time operation, and expounds the timing, time acquisition, time calculation

In-depth understanding of the C-pointer V: Pointers and stringsBasic conceptsStrings can be assigned to different areas of memory, typically using pointers to support string manipulation. A string is a sequence of characters ending with an ASCII

Basic ConceptsStrings can be assigned to different areas of memory, typically using pointers to support string manipulation. A string is a sequence of characters ending with an ASCII character Nul. The ASCII character Nul is represented as a.