C语言初级学习关键词（国外英文资料）.docVIP

C语言初级学习关键词（国外英文资料） The role of # include stdio.h is a preprocessing command that notifies the C language compiler to do some pre-processing before the C program is officially compiled Multi-line comments: / * comment content * / Single comment: / / comment line Note: in the latest C standard, the type of the main function is int instead of void In line 1, the header file is filled: # include stdio. H Line 2 enters the main function name: int main () Line 4 will execute the statement: printf And the int in front of main is the type of the main function, just like what the elevator is made of. Printf () is the format output function, which is remembered for the ability to output the specified information on the screen \ n is an escape character Return is the return value of the function, which is also different depending on the function type. The C program must be executed from the main function A statement or statement is a single line, such as a header file and an executable that needs to be replaced. The function has an obvious indent in the statement, usually by pressing the Tab key to indent. The parentheses should be written in pairs, and they should be deleted if necessary. A semicolon is required at the end of an executable statement; All the symbols in the code are English half Angle symbols. When programming to the variable or function name is the identifier, like we longed for class network every childs shoes have a name, the name is the identifier of the childs shoes. The C identifier is not a name that can be named, it must be followed by certain rules. C language rules, the identifier can be A letter (A to Z, A to Z), number (0 ~ 9), underscore _ string, and the first character must be A letter or an underscore. Also note the following points when using identifiers: (1) the length of the identifier had better not more than eight, because in some versions of the C before an identifier, eight effective, when two identifiers before 8 phase at the same t