Current position indicator in c

Mastering Current Position Indicators in C

The current position indicator in C is a pointer that keeps track of the current position in a file or stream. It is used by the file I/O functions to read and write data at the correct position.

The current position indicator can be changed using the fseek() function. The fseek() function takes three arguments:

• stream: A pointer to the file or stream to modify the current position indicator for.
• offset: The offset from the beginning of the file or stream to move the current position indicator to.
• whence: A value that specifies how to interpret the offset argument. The possible values are SEEK_SET, SEEK_CUR, and SEEK_END.

How to use the fseek() function to move the current position indicator to the beginning of a file:

FILE *fp;

fp = fopen("myfile.txt", "r");
if (fp == NULL) {
  // Handle error.
}

// Move the current position indicator to the beginning of the file.
fseek(fp, 0, SEEK_SET);

// Read data from the file.

The current position indicator can also be obtained using the ftell() function. The ftell() function takes a pointer to the file or stream as its argument and returns the current offset from the beginning of the file or stream.

How to use the ftell() function to get the current position indicator in a file:

FILE *fp;

fp = fopen("myfile.txt", "r");
if (fp == NULL) {
  // Handle error.
}

// Get the current position indicator in the file.
long int offset = ftell(fp);

// Do something with the offset.

The current position indicator is a powerful tool that can be used to control the flow of data in C. By understanding how to use the fseek() and ftell() functions, you can write more efficient and robust code.

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