The operators new and delete give the C++ programmer increased power and increased responsibility.

Improper use of pointers and dynamic memory can cause program crashes that result from heap corruption and memory leaks.

Qt and STL container classes permit the safe use of dynamic memory without adversely affecting performance.

In a multiple variable declaration, the unary * operator applies only to the variable that immediately follows it, not the type that precedes it.

Dereferencing an uninitialized pointer is a serious error that may not be caught by the compiler.

After delete has been applied to a pointer, the state of that pointer is undefined.

It is good practice to assign 0 or NULL to a pointer immediately after you delete it.

Applying delete to a non-null pointer that was not returned by new produces undefined results.

The compiler cannot be relied upon to detect the improper use of delete, so it is the programmer's responsibility to use delete correctly.

A memory leak is produced when a program causes memory to be allocated and then loses track of that memory so that it can neither be accessed nor deleted.