1. 1 COMS 261 Computer Science I Title: C++ Fundamentals Date: September 05, 2005 Lecture Number: 4

2. 2 Announcements Homework Assignment –Continue reading Chapter 2 –Should have read 1.1 – 1.2, 2.1 – 2.5 before lab on Thursday –Read/skim the lab for Thursday Bring lab handout to lab (class) on Thursday

3. 3 Review Decimal to binary conversion Fetch/Execute cycle Programming –Machine Language –Assembly Language –High-Level Languages Think – Edit – Compile – Execute - Test Cycle

4. 4 Outline IDE –Code Warrior Program Organization Objects First C++ Program –Hello, World

5. 5 Assembly Programming Machine Language Program Execute (run) Program Assembly Language Program Think Editor Object Code Different Input Test Cases Assembler abstraction

6. 6 HLL Programming Machine Language Program Think Assembler Editor Compiler Assembly Language Program C++/Fortran Language Program Math Library Object Code Linker Execute (run) Program abstraction Further away from machine details

7. 7 IDE’s Integrated Development Environments –Provides a user interface for the development process Editor, Compiler, Linker, Loader, Debugger, Viewer –We will be using the CodeWarrior IDE throughout this course Show CodeWarrior

8. Program statement –Definition –Declaration –Action Program Organization

9. C++ program –Collection of declarations, definitions, and functions –Program can span multiple files Large programs should span multiple files –Object-oriented approach to programming

10. Object Represents information –Name –Values or properties Data members –Ability to react to requests (messages)!! Member functions

11. Object When an object receives a message, one of two actions are performed –Object is directed to perform a specified action Return a value –Object changes one of its properties

12. // Program: Hello // Author(s): Haul Pemler // Date: 10/05/2005 #include using namespace std; int main() { cout << "Hello world!" << endl; return 0; } A First Program - Hello.cpp Preprocessor directives Insertion statement Ends executions of main() which ends program Comments Function Function named main() indicates start of program Provides simple access String Literal

13. A First Program - Hello.cpp Comments –Not executed, so use them liberally to document your code –Program and programmer name, date, what the program should do, special assumptions, input required, output produced, … // Program: Hello // Author(s): Haul Pemler // Date: 10/05/2005

14. #include A First Program - Hello.cpp Preprocessor Directives –Program executed before the compiler Program #include means that the contents of the file named in the angle brackets should be input –Usually contains common definations There are other types of preprocessor directives