CS 326 Exam 1

CS 326 Exam 1
1. Write-ability/Express-ability

2. Readability

3. Simplicity

4. Reliability

5. Efficiency

6. Portable

7. Reusable Code

8. Popular - answers✔✔Qualities of a good PL



- answers✔✔5 Type Checks that are not done in C++



Statements that execute differently should look different - answers✔✔Def: Regularity of Syntax



Program that does the translation from HLPL to LLPL before the program is run - answers✔✔Def:
Compiler



Program that does the translation step at run time - answers✔✔Def: Interpreter



Runtime Efficiency: running machine code is 10 - 100 x faster than simulation of a virtual machine and
there are no runtime overhead - answers✔✔Adv./Disadv. of Compiler



Runtime Error Handling is much better - answers✔✔Adv./Disadv. of Interpreter



Sequence of commands based on the assignment statement and changeable memory



<var> = <expr> - answers✔✔Def: Imperative Language

, Classes are equivalent only when names are equivalent - answers✔✔Def: Name-Type Equivalence



Classes are equivalent when the signature of the classes are equivalent - answers✔✔Def: Structural-
Type Equivalence



struct apple { int a; double b; }

struct orange { int a; double b; }



apple x;

orange y;



x = y; legal? - answers✔✔How do you prove the difference between name/structural equivalence?



All Possible type errors are always checked for and reported (as opposed to weakly-typed where nothing
is checked) - answers✔✔Def: Strongly-Typed



Fortran 66, BASIC, COBOL - answers✔✔3 Examples of 1st Gen. Langs.



1. Machine Independence

2. Infix syntax

3. Generic operators

4. Procedural abstraction - answers✔✔What did the 1st Generation PL's contribute?



1. Algol 60

2. PL/I

3. Fortran 77 - answers✔✔3 Examples of 2nd Gen. Langs.



1. Recursion

2. Some dynamic data