ftell - Returns Current position of file pointer in C


   #include <stdio.h>
   #include <stdlib.h>

   int main(void){
      FILE *fp;

      if((fp=fopen("test", "rb")) == NULL) {
        printf("Cannot open file.\n");
        exit(1);
      }


      int i;
      if((i=ftell(fp)) == -1L)
         printf("A file error has occurred.\n");
      fclose(fp);
   }