Intro to Art of Programming

1. Intro to Art of Programming Math 130Lecture # 0101/24/05

2. B Smith: Reconsider these topics upon completion of lecture Overview

3. Programming Style • Brace placement • White space • Indentation • Comments

4. Interesting style. What does it do?

5. Obfuscated code output

6. Obfuscated code • That was an extreme example of bad style • The code works beautifully, but I feel sorry the person who inherits Ed's code after he moves on • White space is important

7. ex. brace placement

8. White space • Program structure should make sense without having to study each line of code for 2 hours • Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate. Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate. Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for co mprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.Whitespace is important for comprehending most any information that one wishes to communicate.

9. Indentation

10. Comments • Explanatory remarks within a program • Used to clarify intention of program • /* and */ can be placed anywhere within a program • On your own, try placing a comment in the middle of your “hello there world” output line. • Comments can not be nested! • /* starts out ok /* goes wrong */ here . Kaboom */

11. Top Down Program development • Start w/ the end; detemine the desired output • Determine inputs • Select an algorithm and verify the logic • Write the program • Test program with data

12. Common errors

13. _ Basic data types in C • Integer • Floating point • Double precision • Character

14. Variables

15. Storage requirements • 1 byte = +/- 127 • 2 bytes = +/- 32k • 4 bytes = +/- 2 Gigabytes

16. Other data types • The beauty of C • Abstraction

17. The sizeof() function • Mac vs PC

18. Float and Double

19. ASCII characters

20. Lab 02 – Overview • The Integrated Development Environment (IDE) • MS Visual Studio • Blackboard • overall layout • Submitting assignments • Checking your grades • Communication and feedback

21. BB

22. An example • The canonical “hello world”: #include <stdio.h> int main() { printf("Hello there world!"); return 0; }

23. From Dev-C

24. Dev-C requesting user input

25. Borland's Turbo C++

26. Using DJGPP

27. Entering a program • Edit the program • Save with appropriate filename • *.c, *.cc, *.C, *.cppetc. • Compile • Link (sometimes done automatically) • Run the program

28. Edit and Save

29. Run the program...