C ftell() function

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The ftell() function returns the current file position of the specified stream. 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)


Example:

File: ftell.c




#include <stdio.h>
#include <conio.h>
void main (){  
   FILE *fp;  
   int length;  
   clrscr();  
   fp = fopen("file.txt", "r");  
   fseek(fp, 0, SEEK_END);  
  
   length = ftell(fp);  
  
   fclose(fp);  
   printf("Size of file: %d bytes", length);  
   getch();  
}


Output:

Size of file: 21 bytes




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