1. Learning Objectives What else in C++ Bitwise operator
Register storage class
Conditional compilation
Separate compilation
Exception handling
Namespace

2. Bitwise Operator
Binary Math
0 + 0 = 0
0 + 1 = 1
1 + 1 = 10

3. Bitwise Operator

4. Register Storage Class
Example
register int Miles;
Variable Miles is stored in register instead of main memory for quick access

5. Conditional Compilation
You are trying to write a portable program for different compiler, operating system, or computer.
Example (delete file): unlink for Unix, remove for regular C library
#ifdef Unix
unlink(filename);
#else
remove(filename);
#endif

6. Conditional Compilation
Then, you could place the line
#define Unix
at the top of the file when compiling under an old Unix system

7. Separate Compilation
Divide one program into different header files and source code files
As we did in homework and project
During compilation, the system will replace #include “xxx.h” with the contents of “xxx.h”
Only compile once: save time
Also support conditional compilation

8. Exception handling: Standard approach to handle errors
void function_F() {
Try
<do something>
If(error condition) throw exception; }
Catch (MyException e)
<Handle exception>}

9. Namespace
A namespace is a collection of name definitions, such class definition, variable declarations, and function definitions
#include <iostream>
using namespace std;
Place all the name definitions (for example, cin, cout) into std name space and use this space

10. Namespace With namespace, you can
Redefine the existing names (functions, classes, variables) such as cin, cout
You need to create a new space for them
Assign one name (function, class, variable) with different definitions
You need to create separate spaces for them