How do you get the current position in the file?

How do you get the current position in the file?

You need to use ftell to give you the position within the file. If you want the current line, you’ll have to count the number of line terminator sequences between the start of the file and the position.

What does the current position mean when applied to files?

In C language, ftell() returns the current file position of the specified stream with respect to the starting of the file. This function is used to get the total size of file after moving the file pointer at the end of the file. stream − This is the pointer to a FILE object that identifies the stream.

What is the file position indicator?

The file position indicator is a conceptual entity used in this document to facilitate exact specification of the next record to be accessed within a given file during certain sequences of input-output operations. The concept of a file position indicator has no meaning for a file opened in the output or extend mode.

Which C function will return the current file position for stream?

int ftell
The C library function long int ftell(FILE *stream) returns the current file position of the given stream.

What is Fseek in C?

fseek() is used to move file pointer associated with a given file to a specific position. position defines the point with respect to which the file pointer needs to be moved.

Which file mode Cannot create a new file?

Mode = “r+” − open for reading and writing both, this mode will open the file for both reading and writing purposes i.e. both read and write operations can be performed to the file. This mode cannot create a new file and open() returns NULL, if we try to create a new file using this mode.

Is used to set the position to beginning of the file?

rewind() — Set file position to beginning of file.

What are file positioning functions?

Three functions are available for setting and determining the position of the file pointer for a given file. — Built-in Function: ftell ( fid ) Return the position of the file pointer as the number of characters from the beginning of the file fid .

Which of the following is the correct way to declare pointer?

Explanation: int *ptr is the correct way to declare a pointer.

What is FEOF in C?

C feof function is used to determine if the end of the file (stream), specified has been reached or not. This function keeps on searching the end of file (eof) in your file program. C feof function returns true in case end of file is reached, otherwise it’s return false.

What is whence in C?

whence – This is the current file pointer position from where offset is added.

Does Fopen create a new file?

The fopen function creates the file if it does not exist. r+b or rb+ Open a binary file in append mode for writing at the end of the file. The fopen() function creates the file if it does not exist.

How to find the current line of file pointer in C?

There is no function to get the current line; you’ll have to keep track of it yourself. Something like this: FILE *file; int c, line; file = fopen(“myfile.txt”, “rt”); line = 0; /* 1 if you want to call the first line number 1 */ while ((c = fgetc(file)) != EOF) { if (c == ‘\ ‘) ++line; /* do stuff

How to find the current line position in C?

If you want the current line position (I assume you mean which character of the current line you’re at), you’ll have to count the number of characters between the line terminator sequence immediately preceding the position, and the position itself.

How to calculate the size of a file in C?

This function is used to get the total size of file after moving the file pointer at the end of the file. It returns the current position in long type and file can have more than 32767 bytes of data. stream − This is the pointer to a FILE object that identifies the stream. Here is an example of ftell () in C language.

What does fsetpos ( ) do in C?

fsetpos () (Set File Position) in C. The fsetpos () function moves the file position indicator to the location specified by the object pointed to by position. When fsetpos () is executed ,the end-of-file indecator is reset.