4.2 string Introduction
A string is a sequence of one or more characters, such as "Zing went", but double quotation marks are not part of a string.
4.2.1char array type and NULL CharacterC does not define a special variable type for a string, but
C uses operators to express arithmetic operations. The features of each operator include the number, priority, and combination of the required operands. When two operators share one operand, the last two features determine which operator to apply
14.1 create a structure statement
Structure declaration is the main method used to describe how a structure is combined. The statement is as follows:Struct book {Char title [MAXTITL];Char author [MAXAUTL];Float value;};This statement describes a
# Include node * next;} Node, ** createLinklist (I ==== (PNode) malloc (Node ));(! --> Next = (I =; I Data = I *-> next = (! PHeader-> next = * search (PNode pHeader, = pHeader-> I = (p & (I ++ (p & (I = k) insert (PNode pHeader, PNode pNew, = (=
1: indicates that the compiler contains all information in the stdio. h file.2. parentheses indicate that main () is a function name. int indicates that the function returns an integer. void indicates that the function does not accept any parameters.
I,In the gcc Parameter-Dmacro is equivalent to # define macro-Dmacro = value in the Code. # define macro value-Umacro is equivalent to # undef macro in the code.II,Macro definition,Slash ("\") Is used to resume rows,"#"Is used to convert a parameter
1. String Array. The string pointer can be output directly.
S2 [] =
2. the pointer Variable p is allocated with four storage units.
Processing strings with pointer variables is more convenient than processing strings with arrays.The pointer
Let's look at the example. Example 1: Define a linked list.
stu { int name; age; stu *next; };
Store data elements in a linear table in any storage unit with a set of addresses. : Element (Data Element Image) + pointer (indicating the
Tools used
Sublime Text 2 ()
MinGW ()
1. Configure Environment Variables
After downloading and installing Sublime Text 2 and MinGW, you must add the Path of the Bin directory under the MinGW installation directory to the environment variable Path.
Writing efficient and concise C language code is the goal pursued by many software engineers. Get up!
First move: Change Time with Space
The biggest contradiction in computer programs is the contradiction between space and time. From this point of
1. socket programming principles
A complete inter-network communication process must be composed of two processes and can only use the same high-level protocol. That is to say, TCP is not allowed for communication, and UDP is used for the other end.
In C ++/C Programs, pointers and arrays can be replaced with each other in many places, which leads to the illusion that the two are equivalent.
An array is either created in a static storage area (such as a global array) or on a stack. The array
\ 0 is the end sign of the string in C ++. It is stored at the end of the string. Although it is not counted as the string length, it occupies a byte of memory space. View the \ 0 entry in Baidu encyclopedia. The ending mark of the string specified
The keyword sizeof in C language is an operator. The number of memory bytes of the returned object or type. The type is size_t (defined in ). There are two usage options:
Sizeof unary-expression
Sizeof (type-name)
When sizeof cannot be used:
Here we will briefly introduce how to change the file icon of the specified type by modifying the registry.There is a primary key named HKEY_LOCAL_MACHINE in the registry. Many subkeys starting with the decimal point are displayed under this primary
), So determine whether 19u is the number of duplicates (by simply judging whether 19u's single digit and ten digits are the same .).
), So the problem is to calculate the no-duplicated plural () of 2010u ().
).
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