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CSC 335 Review Game

CSC 335 Review Game. Exam 2. Teams. Rex, Evan, Eric, George Emily, Brian, Sam, Alex Dawson Jacapo , Ryan, Emma, Becca Todd, James, Josh, Peter T Peter D, Nick , Colin, Alex Daniels Asher, Matt, Chad, Heather. Individual Round. 1. What are the values of x & y at the end? int x = 3;

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CSC 335 Review Game

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  1. CSC 335 Review Game Exam 2

  2. Teams • Rex, Evan, Eric, George • Emily, Brian, Sam, Alex Dawson • Jacapo, Ryan, Emma, Becca • Todd, James, Josh, Peter T • Peter D, Nick, Colin, Alex Daniels • Asher, Matt, Chad, Heather

  3. Individual Round

  4. 1. • What are the values of x & y at the end? int x = 3; int y = 1; y = ++x;

  5. 2. What is printed? int *ptr; int x = 5; ptr = &x; *ptr = 4; printf(“%d”, x);

  6. 3. • Finish the function: int add(int *a, int *b){ return __________; }

  7. 4. • Call the function: int f = 712; int g = 63; int sum = add(____,____); int add(int *a, int *b){

  8. 5. • Which is true of C? • It is a third-generation language. • It is imperative. • It is procedural.

  9. 6. • What is y? y = [x % 2 ==1 for x in range(1,6)]

  10. 7. • What is y? y = [x for x in range(1,6) if x%3 ==1]

  11. 8. • What regular expression matches ten symbols (letters, numbers, spaces, whatever) followed by zero or one a?

  12. 9. • Describe Prolog in terms of: - Declarative/Procedural? - Compiled/ Interpreted?

  13. 10. • Describe Prolog in terms of • Paradigm • Generation

  14. 11. • Do they unify? a(b(X),X,c(d(Y))) with a(Z,e,c(A))

  15. 12. • What does it do? mystery([4|T], X):- mystery(T,X1), X is X1+1. mystery([H|T],X):-mystery(T,X).

  16. 13. • What language does it generate? S -> AB A -> aA | a B -> bbb

  17. 14. • What makes a language context-free?

  18. 15. • If L1 = {abn, n> 0} and L2 = {anb2n, n>0} what is L1 intersect L2?

  19. 16. • How do you prove a language is ambiguous?

  20. 17. • What is special about a line of C code that starts with the # symbol?

  21. 18. • Consider the language anbn. Is it: • Regular • Context-free • Both • Neither

  22. 19. • When might you declare a C variable with the “register” keyword? You need a register variable if it is a primitive that you know you are going to access a lot.

  23. 20. • What is aliasing? Aliasing is having 2 names for the same address in memory.

  24. 21. • Which regular expression gives an odd number of a’s? r’(aa)*a’

  25. 22. • What language does it generate? S -> abS | ab Regular expression would be (ab)+. That is, ab as a pair occurring one or more times.

  26. 23. • If L1 = {abn, n> 0} what is L12? • L12 = {abnabm, n,m> 0}

  27. 24. • Which can you write a PDA for? • A: {anbn+2, n > 0} • B: {wLwR, w is any string of a’s and b’s, L has only a’s} • C: {Any string where the number of a’s is twice the number of b’s} All of them.

  28. All-Play

  29. All-Play • What is the result for the different passing schemes? global int z = 0; func(z); write(z); void func(int x){ x = z+1; z= z+10; }

  30. Write regular expressions • String is either 4 or 5 digits. • String is either 40 or 50 digits. • String includes 2 of the same number.

  31. Write the grammar: • L = {anbm, m>=n+2}

  32. Write a prolog predicate that takes a number and generates a list of that number down to one. • generate(+Num, -List) • Example: generate(5,L) givesL=[5,4,3,2,1]

  33. All-play • Draw a PDA for the language: • anbm: n > m

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