The process analysis of C language learning 1 --- C program based on Linux

osc_ 0hs26yvj 2021-01-21 11:17:36
process analysis language learning program

One 、C Language program running process
1. edit

  • Choose a suitable program editing software , such as Notepad++, perhaps sublime Edit software , The more advanced ones are VSCode.

2. compile

  1. Preprocessing : The process is to copy the specific content of the header file from the specified path to the current program , If there are macro definitions in the program , Expand the macro definition , Delete all comments in the program at the same time . Generate a suffix of .i The file of .
    The order is gcc hello.c -E -o hello.i
  2. compile : The process is to check whether there are syntax errors in the source program , If it passes the test , Will .i Translation of files into assembly files . Generate a suffix of .s The file of .
    The order is gcc -S hello.i -o hello.s
  3. assembly : The process is to .s The file is translated into a binary object file that the machine can recognize . Generate a suffix of .o The file of .
    The order is gcc -c hello.s -o hello.o
  4. link : The process is to involve this program to all the target files, that is .o file 、 library “ Adhesion ” together , Get the final executable .
    example : If the program is designed to printf function , Then the corresponding printf.o file , The linking process is to involve these .o The files are all linked together .
    The order is gcc hello.o -o hello

3. function

  1. About main The parameters of the function main(int argc , char * argv[] )
  • argc The original meaning is argument count Translated into The amount of content . The concrete meaning means Pass to main The number of arguments to the function ( A few strings of characters ).
  • argv The original meaning is argument value Translated into The exact meaning of the content . The specific storage is passed to main The address of the string of the function .
    argv[0] There's the second one 0 The first address of a string
    argv[1] Holds the first address of the first string . … By analogy .

  1. About main The return value of the function
  • return 0 Indicates that the program is executed correctly and exits normally
  • return -1 Indicates that the program being executed has insufficient permissions
  • return -2 The executed file does not exist
  • return -3 Error executing code
  1. About the definition of header file
  • #include “stdio.h” The header file defined by double quotation marks indicates that the header file is retrieved from the current path first , If you can't find , Then enter the standard C Search in database
  • #include <stdio.h> Two angle brackets define the header file representation directly from the standard C Search the header file information in the database
  • Generally speaking , Self defined header files use double quotes , Use angle brackets to call functions already written by the system . Such as :stdio.h string.h etc. .
  1. About C The specific operation process of the program , It will be given in later chapters

All of the above are personal opinions , If there is a mistake , Welcome to correct .

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