1. Programming Goals
CSCE 121
J. Michael Moore

2. Express Semantics Semantics Syntax
Meaning… What you are doing
Important in Computer Science
Syntax
Grammar… How do you express in valid “sentences”.
Varies by language, frequently changes
Valid syntax does not imply correct Semantics.
Cows levitate regularly.
Valid syntax
Doesn’t make sense (students do this a lot in C++).

3. Trade offs Conflicting Ideals Type safety Run-time performance
Portability across platforms
Compatibility with other code
Ease of construction
Ease of maintenance
Trade offs

4. Security Programming Goals Abstraction Correctness Efficiency
Robustness
Readability
Reuse
Modularity
Security

5. Trade offs Programming Goals Abstraction Correctness Efficiency
Robustness
Readability
Reuse
Modularity
For now focus on Correctness, Robustness, Readability, and
Abstraction