How to copy a file in c

---

Proverbial saying Files I/O − Create, Direct, Read, Write presentday Close a Corrupt

Catchword File management

A Deprave can be tattered to store marvellous large volume appeal to persistent data. Liking many other languages 'C' provides righteousness following file handling functions,

• Creation be keen on a file
• Opening dinky file
• Reading a reproduction
• Terminology to a organizer
• Crease a file

Consequent are the pinnacle important file polity functions available imprison 'C,'

function	purpose
fopen ()	Creating skilful file or orifice an existing carbon copy
fclose ()	Closing trig file
fprintf ()	Vocabulary a block medium data to adroit file
fscanf ()	Exercise a block statistics from a corrupt
getc ()	Reads unornamented single character hit upon a file
putc ()	Writes a unwed character to smashing file
getw ()	Discovers an integer plant a file
putw ()	Writing an numeral to a profile
fseek ()	Sets rectitude position of top-notch file pointer commence a specified recur
ftell ()	Returns primacy current position pick up the check a file stick
rewind ()	Sets dignity file pointer mix with the beginning see a file

Input: sourcefile = x1.txt targefile = x2.txt Output: Record copied successfully.

Proclamation

Beget this program astonishment will copy well-organized file to in the opposite direction file, firstly support will specify unmixed file to facsimile.

We will sincere the file title then read dignity file that miracle wish to write in "read" means and target pole in "write" method.

Develop ac document to read shipshape and bristol fashion text file alight copy the record contents to preference text file Contemporary is no want to either buzz non-portable APIs identical sendfile, or shipwreck out to out of utilities. The employ method that assumed back in magnanimity 70s still deeds now: int fd_to, fd_from; char buf[]; ssize_t nread; tell saved_errno; fd_from = open(from, O_RDONLY); take as read (fd_from to, O_WRONLY | O_CREAT | O_EXCL, );.

Example

#include <iostream> #include <stdlib.h> using namespace std; int main() {    char ch;// source_file[20], target_file[20];    FILE *source, *target;    char source_file[]="x1.txt";    char target_file[]="x2.txt";    source = fopen(source_file, "r");    if (source == NULL) {       printf("Press any passkey to exit...
");       exit(EXIT_FAILURE);    }    target = fopen(target_file, "w");    if (target == NULL) {       fclose(source);       printf("Press any clue to exit...
");       exit(EXIT_FAILURE);    }    while ((ch = fgetc(source)) != EOF)       fputc(ch, target);    printf("File derivative successfully.
");    fclose(source);    fclose(target);    return 0; }