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14.




 

, . , .

: .

ASCII . , , : 13 10 (0xD 0xA).

() , .

. ( ) .

- , . , stdin stdout.

, stdio.h io.h. , - , . , , . - . BUFSIZ, stdio.h 512 ( ).

 

, . ( ) , .. , .

:

FILE * ID___;

FILE , stdio.h :

struct FILE {

short level; ; 512 ; level = 0, ;
unsigned flags; , , ;
char fd; , .. , ;
unsigned char hold; , .. ungetc -;
short bsize; ;
unsigned char buffer; ; , ;
unsigned char *curp; ; ;
unsigned istemp; ;
short token; ;

};

 

, .. , .

FILE* fopen (char * ID_, char *);

(, ) ( ).

, .. ID , , a:Mas_dat.dat Mas_dat dat, , d:\\work\\Sved.txt Sved txt, work.

. \, .

fopen ( ). NULL. , , , , .

, .

:

w (write); , ; , ;

r (read); , ;

a (append) ;

r + (w +) , .. , ;

a + , a, ( );

t ;

b ;

. : w + b , wb +, rw +, w + t , rt +, .

.

, , .

:

FILE *f; f;

f = fopen (" d:\\work\\Dat_sp.dat ", "w"); f, Dat_sp.dat d work, :

FILE *f = fopen ("d:\\work\\Dat_sp.dat", "w");

 

int fclose ( );

, : fclose (f);

:

void fcloseall (void);

, , .

FILE* freopen (char *ID_, char *, FILE *_);

, ( ), fclose, , fopen, ( ID_ ).

, .

FILE* tmpfile (void);

w + b. () .

 

-

- :

-;

-;

- .

- .

,

fprintf, fscanf, fgets, fputs.

, (. . 5.3, 5.4) printf, scanf, gets puts. . , printf , fprintf , .

:

#include<stdio.h>

void main(void)

{

FILE *f1;

int a=2, b=3;

if(! (f1 = fopen(d:\\work\\f_rez.txt,w+t))) { // f 1 = NULL

puts(Open File Error!);

return; // exit (1);

}

fprintf(f1,\t \n);

fprintf(f1, %d %d = %d\n, a, b, a+b);

fclose(f1);

}

, , , , printf .

, , .

() , , , . - fread fwrite, - .

.

unsigned fread (void * p, unsigned size, unsigned n, FILE * f);

f n size , p. . EOF (End Of File ).

:

unsigned fwrite (void * p, unsigned size, unsigned n, FILE * f);

f n size , p.

 

, , . , , .

, .. .

/++ . fseek, .

:

int fseek (FILE * f, long size, int code);

size , f, code, :

  (SEEK_SET);
  (SEEK_CUR);
  (SEEK_END).

, , , .

, (, ) .

(fseek) .

. :

long ftell (FILE * f);

1 .

 





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