C語言基本語法 實例代碼教程- 我們已經看到的C程序的基本結構，所以這將是很容易理解其他的C語言編程的基本構建塊。
你已經看到的C程序的基本結構，所以這將是很容易理解其他的C語言編程的基本構建塊。
C語言的記號
C程序由各種令牌，令牌可以是關鍵字，標識符，常量，字符串文字或符號。例如，下面的C語句包含五個令牌：
printf("Hello, World! \n");The individual tokens are:
printf ( "Hello, World! \n" ) ;
分號 ;
In C program, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity.
For example, following are two different statements:
printf("Hello, World! \n");
return 0;註釋
Comments are like helping text in your C program and they are ignored by the compiler. They start with /* and terminates with the characters */ as shown below:
/* my first program in C */
You can not have comments with in comments and they do not occur within a string or character literals.
標識符
C標識符是用來標識變量，函數的名稱，或任何其它用戶定義的項目。開始的標識符以字母A到Z或az或下劃線_由零個或多個字母，下劃線和數字（09）。
C does not allow punctuation characters such as @, $, and % within identifiers. C is a case sensitiveprogramming language. Thus Manpower and manpower are two different identifiers in C. Here are some examples of acceptable identifiers:
mohd zara abc move_name a_123 myname50 _temp j a23b9 retVal
關鍵字
The following list shows the reserved words in C. These reserved words may not be used as constant or variable or any other identifier names.
| auto | else | long | switch |
| break | enum | register | typedef |
| case | extern | return | union |
| char | float | short | unsigned |
| const | for | signed | void |
| continue | goto | sizeof | volatile |
| default | if | static | while |
| do | int | struct | _Packed |
| double |
C語言中的空白行
A line containing only whitespace, possibly with a comment, is known as a blank line, and a C compiler totally ignores it.
Whitespace is the term used in C to describe blanks, tabs, newline characters and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statement, such as int, ends and the next element begins. Therefore, in the following statement:
int age;
必須有至少一個空白字符（通常是int和年齡的編譯器能夠區分它們之間有一個空格）。另一方面，在下面的語句
fruit = apples + oranges; // get the total fruit
任何空白字符是必要的之間水果和=，=蘋果，雖然你是自由的，包括一些，如果你想可讀性目的。