Detailed explanation of three types of high-frequency function operation of basic C programming under liinux class I - file operation function (f)

File manipulation functions

fput and fputs

fputc The function is used to put a character （ character constants / Character variables ） Write to disk file
General form ：

 ch=fputs（ch,fp）;

among ch Is the character to write ,fp Is a file pointer variable , If the writing is successful, the written characters will be returned , Write failure returns EOF;

fputs Similar to it , Write a string to the specified file （ String constant , String group name , Variable ）
General form ：

fputs（ character string , The file pointer ）;

fgetc and fgets

fgetc The function is used to read the character assignment from the specified file ch
General form ：

ch=fgetc（fp）;

The file must be opened by reading or writing , When the function encounters the end file character , The end of file flag will be returned EOF;
fgets Similar to it , Used to read a string from the specified file into the character array
General form ：

fgets（ Character array name ,n, The file pointer ）;//n Represents the number of strings .

fprintf（ write in ） and fscanf（ Read ）

fprintf General types of functions ：

ch=fprintf( File type pointer , Format string , Input list );

fscanf General types of functions ：

fscanf（ File type pointer , Format string , Output list ）;

fread and fwrite

fread It's from fp Read from file pointed to count Time , Each read size byte , The read information is saved in buffer In the address
General form ：

fread（buffer,size,count,fp）;

fwrite Yes, it will buffer Address start information output count Time , Every time size Bytes to fp In the file pointed to
General form ：

fwrite（buffer,size,count,fp）;

fseek

fseek Function is used to move the position pointer inside the file
General form ：

fseek（ File pointer type , Displacement , The starting point ）;

rewind

rewind The function returns the position pointer to the beginning of the file , no return value
General form ：

int rewind（ File type pointer ）;

ftell

ftell Function to get the current location in the streaming file , And use the displacement relative to the file header to express
General form ：

long ftell（ File type pointer ）;