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Showing content from https://www.cplusplus.com/reference/cstdio/ftell/ below:

function

<cstdio>

long int ftell ( FILE * stream );

Get current position in stream

For binary streams, this is the number of bytes from the beginning of the file.

For text streams, the numerical value may not be meaningful but can still be used to restore the position to the same position later using fseek (if there are characters put back using ungetc still pending of being read, the behavior is undefined).

stream

Pointer to a FILE object that identifies the stream.

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/* ftell example : getting size of a file */
#include <stdio.h>

int main ()
{
  FILE * pFile;
  long size;

  pFile = fopen ("myfile.txt","rb");
  if (pFile==NULL) perror ("Error opening file");
  else
  {
    fseek (pFile, 0, SEEK_END);   // non-portable
    size=ftell (pFile);
    fclose (pFile);
    printf ("Size of myfile.txt: %ld bytes.\n",size);
  }
  return 0;
}

fseek

Reposition stream position indicator (function)

fgetpos

Get current position in stream (function)

rewind

Set position of stream to the beginning (function)

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