What is fseek () function?

The fseek() function in PHP is an inbuilt function which is used to seek in an open file. It moves the file pointer from its current position to a new position, forward or backward specified by the number of bytes.

What is Fseek and Ftell in C?

ftell() is used to store the current file position. fseek() is used to relocate to one of the following: A file position stored by ftell() A calculated record number ( SEEK_SET )

Why do we need Fseek?

fseek() is a very useful function to traverse through a file. We can ‘seek’ to different locations, by moving the file pointer. This enables us to control where we can read and write to and from files.

What is the return value of Fseek in C?

zero
The fseek function returns zero if successful. If an error occurs, the fseek function will return a nonzero value.

What is offset in Fseek?

fseek() in C language, is use to move file pointer to a specific position. Offset and stream are the destination of pointer, is given in the function parameters. If successful, it returns zero. offset − This is the number of bytes from the position. whence − This is the position from where offset is added.

What is offset in C?

Description. The C library macro offsetof(type, member-designator) results in a constant integer of type size_t which is the offset in bytes of a structure member from the beginning of the structure. The member is given by member-designator, and the name of the structure is given in type.

Which is the Ftell () syntax?

We can use ftell() function to get the total size of a file after moving file pointer at the end of file. We can use SEEK_END constant to move the file pointer at the end of file. Syntax: long int ftell(FILE *stream)

What is the difference between Lseek and Fseek?

Use fseek when using the C stdio library. Use lseek when using low-level POSIX file descriptor I/O. The difference between the various seek functions is just the kind of file/stream objects on which they operate. On Linux, seekg and fseek are probably implemented in terms of lseek .

What is Ferror C?

The ferror() function is used to check for the file error on given stream. A return value of zero indicates no error has occurred, whereas a non-zero value indicates an error occurred.

What is a offset?

Offset refers to how your car’s or truck’s wheels and tires are mounted and sit in the wheel wells. Most wheels on front-wheel drive cars and newer rear-drive vehicles have positive offset. Negative offset is when the hub mounting surface is behind the wheel centerline.

What is offset in database?

The OFFSET argument is used to identify the starting point to return rows from a result set. Basically, it exclude the first set of records. Note: OFFSET can only be used with ORDER BY clause.

What is the return type of Ftell () function?

The ftell function returns the current file position indicator for stream. If an error occurs, the ftell function will return -1L and update errno.

What is the use of fseek() function in C programming?

The C library function int fseek(FILE *stream, long int offset, int whence) sets the file position of thestream to the given offset. Following is the declaration for fseek() function. stream − This is the pointer to a FILE object that identifies the stream. offset − This is the number of bytes to offset from whence.

What is the use of F seek in C?

C library function – fseek() Description. The C library function int fseek(FILE *stream, long int offset, int whence) sets the file position of the stream to the given offset.

What is the difference between fseek_set and F seek_Cur?

SEEK_CUR: It indicates the current position of the pointer of the file. SEEK_END: As the name indicates, it moves the pointer of the file to the end of the file. SEEK_SET: As the name indicates, it moves the file pointer to the beginning of the start of the file How does fseek () function work in C?

What is the difference between fseek and rewind function in C?

Rewind function is used to move file pointer position to the beginning of a file. Whereas fseek function is used to change the file pointer for the specified stream. What is the difference between fseek and fread/fwrite function in c?