file io - appending in C failing, simply overwriting -

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Instead of adding "ABC" (and thus finally a file is filled with abcabcabc ....), no matter how many The times I run it, only include myfile "abc" .... How can I add? 

  #include & lt; Stdio.h & gt; #include & lt; String.h & gt; Int main () {char strng [10]; Strcpy (strng, "abc"); File * my_file; My_file = fopen ("myfile", "a +"); If (my_file == NULL) {printf ("problem \ n");} filitt (strng, sizeof (strng), 1, my_file); Printf ("add% s \ n", strng); Fclose (my_file); }

except for this fact: 

  (Strang, strang, 1, my_file);

should be: 

  filitt (strng, strlen (strng), 1, my_file);

This works for me.


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