1. Smalltalk Interpreted by Alan Frazier & Brian Sparks

2. History Smalltalk was originally designed as a PL that would be easy to learn. One of it’s original design intentions was to be a learning environment for children. It is used for application development & for teaching purposes. 1 st language to support a multi-window GUI.

3. Technical design factors Paradigm Binding times Parameter passing Data types Simplicity & Readability Runtime Efficiency Library Support & Debugging help Longevity & Portability

4. Paradigms & Binding Smalltalk is known mainly for it’s efforts to be as object oriented as possible. Quite possibly the epitome of the object oriented paradigm. Smalltalk is an interpreted language, like Perl. It also uses dynamic binding, a trait common to most interpreted languages.

5. Parameter Passing Smalltalk uses messages to pass information to objects & to get them to follow certain behaviors specific to that object. Ex1: 5 factorial Ex2: ‘hello’ size

6. Data Types As mentioned before, all data are encapsulated into objects. Fundamental Data Types, ‘literals’: String: ‘hello’ ‘string’ ‘bob’ ‘%@#^|\’ String: ‘hello’ ‘string’ ‘bob’ ‘%@#^|\’ Number: 123 -234 ¾ -½ 4.567 -2.34e10 Number: 123 -234 ¾ -½ 4.567 -2.34e10 Character: $Y $G $@ Character: $Y $G $@ Symbol: #name #+ #at:put: Symbol: #name #+ #at:put: Array: #(1 2 3 4) #(1 ‘two’ $Y) #(‘ab’ ‘cd’ ‘ef’) Array: #(1 2 3 4) #(1 ‘two’ $Y) #(‘ab’ ‘cd’ ‘ef’)

7. Simplicity & Readability Smalltalk syntax consists of: Statements (cascaded statements) Statements (cascaded statements) Assignments Assignments Comments Comments Temporary variables Temporary variables Blocks of code Blocks of code Has a readable syntax and is considered a literate language by some.

8. Runtime Efficiency It’s an interpreted PL, It’s an interpreted PL, With dynamic binding, With dynamic binding, & no type declarations. What do you expect?? What do you expect??

9. Library Support & Debugging Help A multitude of free class libraries can be found on the web. Native Smalltalk debugging tools, Oh Yea!

10. Longevity & Portability Rinse, Wash, Repeat! Currently a hot product for prototyping. Many commercial & free implementations: GNU Smalltalk GNU Smalltalk Squeak Squeak IBM IBM ObjectShare ObjectShare

11. Closing Comments Our program Smalltalk is definitely a niche language. It does have it’s high points and is very useful for certain applications. Its popularity is growing and it is being used for more commercial projects and may become more prominent in the future.

12. References http://cgibin.erols.com http://www.object-arts.com http://www.cs.ucf.edu/courses/cop4331/hu ghes/Summer1998/Tutorials/Smalltalk/oop.html http://www.cs.ucf.edu/courses/cop4331/hu ghes/Summer1998/Tutorials/Smalltalk/oop.html http://www.s- direktnet.de/homepages/neumann/lang_c mp.en.htm http://www.s- direktnet.de/homepages/neumann/lang_c mp.en.htm http://www.dylanworld.com/advocacy/com petitive.html http://www.dylanworld.com/advocacy/com petitive.html