Flushing the contents of a char var

[Nobody/Anonymous]

Simple question, how can i make myself sure that a "char something[somesize];, declared in its own block of {} will have its content totally flushed betweens calls for the functions? Heres what im talking about:

int SomeFunction(char TheParam) {
  char ThatString[150];
 
  sprintf(ThatString, "", 0); /I need to be sure that all the times this functions is called, ThatString = 0.
  strcat(ThatString, TheParam);
 
  SendMessage(hWndSomeControl, LB_ADDSTRING, 0, (LPARAM) (LPCTSTR) ThatString);       
  sprintf(ThatString, "", 0); //Clearing the string, is there any other way to do it?
  sprintf(TheParam, "", 0); //Clearing the string, is there any other way to do it?
 
  return 0;
}

[Anonymous]

declare as char ThatString[150] ="";

[Nobody/Anonymous]

Nope, didnt do it. Doint it like you said, weird  characters start  to accumulate in the beginning of the string every time the Message is sent to the Control.

And with the sprintf(ThatString, "", 0); that does not happens :\

It sux :\ I have no problem with using this sprintf thing, but it gives me lots of gcc warnings...