PT> void doit(char *teststring)
PT> {
PT>    teststring = NULL;
PT> }
PT> void main( void )
PT> {
PT>    char *mystring = "blabla";
PT>    doit(mystring);
PT> }
PT>   OK this works - and at the very same moment , it doesn't
PT>   ;-) I mean : it doesn't crash, but it doesn't do what I
PT>   want it to do: when returning from the call to doit ,
PT>   mystring still contains "blabla" and I want it to contain
PT>   NULL...
PT>   How can I change that 'teststring' argument 'permanently'?
   doit() is given a pointer to the stringspace.
   If you want to effect the stringspace, you must dereference
   the pointer, either by means of pointer notation or array
   notation.
*teststring = (char)'\0';
teststring[0] = (char)'\0';
   If you want to redifine the pointer itself, then you should
   realize that the variable teststring and the variable
   mystring are two separate variables. You can change the
   value of mystring by returning a pointer value.
char* doit(char *teststring)
{
   teststring = NULL;
   return teststring;
}
void main( void )
{
   char *mystring = "blabla";
   mystring = doit(mystring);
}

> ] It's never funny when you have to explain it. [ Joe Friday ]

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