C Language Foundation (i)

1, write code Considerations:      (1) Do not forget to import the header file #include <stdio.h>      (2) The main function has only one       (3) After writing a line of code to have the English semicolon as the end "; "      (4) denotes the English curly braces" {  "and" &NBSP;} "of the block of code. Must appear in pairs       (5) return 0 must be placed at the end of the program, after the code is not executed, you can omit       (6) "/" is a translator, plus different letters to represent different functions, the most commonly used "/n" is the newline character  2, C language compilation process:       (1) Create a C file Touch first.c      (2) Input code           #inlcude& lt;stdio.h>          int main ()           {    &N Bsp          printf ("Hello world!\n");              & Nbsp;return 0;          }      (3) Compile C file cc first.c-c, generate target file " FIRST.O "      (4) Link destination file with library function target file cc FIRST.O generate executable a.out      (5) Execute this executable file./a.out on the screenOn output "Hello world!"       NOTE: Regardless of the source file's file name, the resulting executable is a.out  3, data type       shaping: int integer takes 4 bytes     & nbsp           long Long integer 8 bytes                 Short Integer 2 bytes       Real (float type): Float single precision 2 bytes                     & nbsp             Double double 4 bytes       Char: char requires single quote "'"     &nbs to describe a single letter p; Note: Commonly used for development is int and float 4, comments      //: Single-line comments to explain a line of code      /* */: Block comments, The ability to interpret a piece of code or to indicate the file at the beginning of a code file       develop a habit of writing comments that will make your code more readable    

C Language Foundation (i)