1. C Programming Constants and Control Structures

2. Constants Can be defined in two ways. –Traditional Method –#define PI 3.14 #define is a preprocessor command. The preprocessor replaces every occurrence of PI with the literal string 3.14. #defined constants are conventionally uppercase.

3. Dangers of #define If you #define a name it may affect other code. –#define loop for –would replace the word “loop” with “for” in all code which might have unforeseen side effects.

4. const const is a new keyword developed in the ANSII standard. Use is const name; Has the advantage of checking the data type of your constant. Does not introduce side effects.

5. const const variable may only be initialized not changed. –const double top_salary= 4000; –top_salary = 3250; // would generate an error.

6. #define vs. const #define is easy to use and understand With proper safeguards it will not be a problem. const is the new way allows type checking sometimes seems strange to oldtimers.

7. while Loop while(condition)

8. do Loop do while( condition )

9. for Loop for( ; ; )

10. switch Statement switch { case : ; break; default: ; }