Pretreatment, library functions, keywords, comments, statements:
Pretreatment: # beginning with some commands, features, these commands are before compiling the source code file, a certain treatment.
#include <stdio.h> stdio.h processing the file is to copy and paste the instruction.
Library function: With the compiler is available to developers of some of the commonly used functions.
system: initiating a cmd command of
putchar: a character output
getchar: Get a character
_getch: no echo of acquiring a character
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printf (format control string, .....): Output Formatting
scanf (control string format, .....): formatted input
Basic common, it must be remembered
% D decimal input / output an integer,
% C character
% Lf float
% S string
Recommended familiar:
% X hexadecimal integer
% O octal
% P value output in a form of an address.
We know about the two functions:
gets: Gets a string
puts: Output a string
Keywords: word has a special meaning and can not be used for other purposes.
What is called for other purposes, it can not be used as
identifiers
.
Not int int; int char;
int INT this is possible.
int Int this is possible.
Note: Tips acts described, good coding practices is as detailed as possible.
Statement: ends with a semicolon, the basic unit of execution of C language
What makes up a C language: Function.