C programming Interview questions and answers: Write a c program to find out the size and drive where file has stored of any given file?

#include "time.h"

#include "sys\stat.h"

#include "stdio.h"

int main(){

struct stat status;

FILE *fp;

fp=fopen("test.txt","r");

fstat(fileno(fp),&status);

printf("Size of file : %d",status.st_size);

printf("Drive name : %c",65+status.st_dev);

return 0;

}

Explanation:

Function int fstat (char *, struct stat *) store the information of open file in form of structure struct stat

Structure struct stat has been defined in sys\stat.h as

struct stat {

short st_dev, st_ino;

short st_mode, st_nlink;

int st_uid, st_gid;

short st_rdev;

long st_size, st_atime;

long st_mtime, st_ctime;

};

Here

(a)st_dev: It describe file has stored in which drive of your computer ,it returns a number.

(b)st_mode: It describes various modes of file like file is read only, write only, folder, character file etc.

(c)st_size: It tells the size of file in byte.

(d)st_ctime:It tells last data of modification of the file in date format.

Note: 65 is ASCII value of A .So after adding status.st_dev with 65 it will return appropriate drvie name as in your computer.

2. Write a c program to delete a file.

3. Write a c program to copy a file from one location to other location.

6. Write a c program which writes string in the file.

C programming Interview questions and answers