Dereferencing deleted pointers always result in an Access Violation?

Question

I have a very simple C++ code here:

char *s = new char[100];
strcpy(s, \"HELLO\");
delete [] s;
int n = strlen(s);

If I run this code from

Answer 1

Dereferencing a pointer after delete is undefined behavior - anything can happen, including but not limited to:

• data corruption
• access violation
• no visible effects

exact results will depend on multiple factors most of which are out of your control. You'll be much better off not triggering undefined behavior in the first place.