INTERVIEW QUESTIONS PROGRAMMING LANGUAGES C DETAILS

Question: Write a program which accepts a filename as a command line argument and reverses the contents of the file( ie first character

becomes the last character of the file and so on)


Input: The program takes the file name whose content should be reversed.

Output: The program reverses the contents of the file.

Answer: #include #include int main(int argc, char *argv[]){ int fd, i, fsize; char *first=(char *) malloc(1); char *last=(char *) malloc(1); if (argc != 2) { printf("pass two argumentsn"); exit (-1); } /* Open the file */ fd = open(argv[1], O_RDWR); if (fd == -1) { printf("error in file openingn"); exit (-1); }#ifdef PRINT printf("File Open Sucessn");#endif /* Find the file size */ fsize = lseek(fd, 0, SEEK_END);#ifdef PRINT printf("File Size = %dn", fsize);#endif /* Reverse the file */ for (i=0; i

#include #include int main(int argc, char *argv[]){ int fd, i, fsize; char *first=(char *) malloc(1); char *last=(char *) malloc(1); if (argc != 2) { printf("pass two argumentsn"); exit (-1); } /* Open the file */ fd = open(argv[1], O_RDWR); if (fd == -1) { printf("error in file openingn"); exit (-1); }#ifdef PRINT printf("File Open Sucessn");#endif /* Find the file size */ fsize = lseek(fd, 0, SEEK_END);#ifdef PRINT printf("File Size = %dn", fsize);#endif /* Reverse the file */ for (i=0; i Source: CoolInterview.com

#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<string.h>

int main()
{
int fd=0,i=0,len=0;
char buf[100];
fd=open("file.txt",O_RDONLY);

read(fd,buf,sizeof(buf));
len=strlen(buf);

for(i=len;i>=0;--i)
printf("%c",buf[i]);
printf(" ");

}
Source: CoolInterview.com

The above program makes an assumption that the length of the file is less than 100. If the Source: CoolInterview.com

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