c program to check whether file is empty or not

C program to check whether file is empty or not 

  fp =  fopen ("file1.txt", "a+");

   if (NULL != fp) {

    fseek (fp, 0, SEEK_END);

    size = ftell(fp);

    if (0 == size) {

        printf("file is empty\n");

    }

  }