uint* a = new uint;
*a = 5;

cout<<"Before delete:tt"<<*a<<" on address: "<<a<<endl;
delete a;
cout<<"After delete:tt"<<*a<<" on address: "<<a<<endl;
*a = 7;
cout<<"After delete & set:t"<<*a<<" on address: "<<a<<endl;

Before delete:      5 on address: 0x7fe994c02700
After delete:       5 on address: 0x7fe994c02700
After delete & set: 7 on address: 0x7fe994c02700

Process finished with exit code 0

delete a;
cout<<"After second delete: "<<*a<<" on address: "<<a<<endl;

Before delete:      5 on address: 0x7f8193500000
After delete:       5 on address: 0x7f8193500000
After delete & set: 7 on address: 0x7f8193500000
my_test_prog(1774,0x7fffafdc8340) malloc: *** error for object 0x7f8193500000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Signal: SIGABRT (signal SIGABRT)
Terminated due to signal 6

Process finished with exit code 0