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comp115/155 past paper questions (1 Viewer)
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doe
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[edit - 17 is E ]
1. E
2. C
3. C
4. D
5. C
6. E
7. D
8. C
9. B
10. A
11. B
12. D -> only one has to be false for && to fail
13. D
14. B
15. A
16. E
17. D
18. D
19. D
20. D
21. B
22. D
23. A
24. ? -> none of them
A gives "1,2,3,4,"
B gives "1,2,3,4,5,"
C gives "0,1,2,3,4,5"
D gives "0,1,2,3,4,5,5"
E gives "1, 2, 3, 4, 5"
very strange.
25. B
26. C
27. A
B - seeds is private, main cant access it.
C - color is a string, not a function
D - seeds is private
E - the constructor only takes 1 argument
28. E
29. B
i just did a truth table and got
(p && (! (q || (! (p && r))))) is true only if p = 1, q = 0, r = 1
which i think is what B says.
30. E
the code
cout << doIt(str, a);
need doIt to return a string
only C and E return a string, and C returns fx which is the integer argument.
1. E
2. C
3. C
4. D
5. C
6. E
7. D
8. C
9. B
10. A
11. B
12. D -> only one has to be false for && to fail
13. D
14. B
15. A
16. E
17. D
18. D
19. D
20. D
21. B
22. D
23. A
24. ? -> none of them
A gives "1,2,3,4,"
B gives "1,2,3,4,5,"
C gives "0,1,2,3,4,5"
D gives "0,1,2,3,4,5,5"
E gives "1, 2, 3, 4, 5"
very strange.
25. B
26. C
27. A
B - seeds is private, main cant access it.
C - color is a string, not a function
D - seeds is private
E - the constructor only takes 1 argument
28. E
29. B
i just did a truth table and got
(p && (! (q || (! (p && r))))) is true only if p = 1, q = 0, r = 1
which i think is what B says.
30. E
the code
cout << doIt(str, a);
need doIt to return a string
only C and E return a string, and C returns fx which is the integer argument.
Last edited:
Orange Juice
so worthless i am
get your priorities straight! tv is less than (for some reason less than or equal symbols dont come up...)helping first years with comp115... sheesh you think that its a written law...Originally posted by doe
ill re check 24 but its simpsons time
Orange Juice
so worthless i am
oops... edit
MicK_eT
Terry mate!
*hyperventilates*.. gonna die... :'( i cant seem to do any of the questions...
doe
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it has to do with the << operator.
cout << x
means "take whatever x is and print it to the stream cout"
if x is a fuction, it will evaluate that fuction and print the result, eg
cout << foo();
is equivalent to
tmp = foo();
cout << tmp;
so for q30, doIt needs to return a string cause the code would be like
int a = 20;
tmp = doIt(str, a);
cout << tmp;
the problem with a is it doesnt return a string, it returns void, it might even work, but it's not "correct".
same for q26
mumble takes an integer argument, prints it out, increments it and returns the incremented value. so in main() its going
int x = 5;
cout << x;
tmp = mumble(x); //will print out 5 and return 5 + 1
cout << tmp; //prints 6, the return value from mumble()
the first time mumble is called (with mumble(2)) the return value is just ignored, which is ok too
cout << x
means "take whatever x is and print it to the stream cout"
if x is a fuction, it will evaluate that fuction and print the result, eg
cout << foo();
is equivalent to
tmp = foo();
cout << tmp;
so for q30, doIt needs to return a string cause the code would be like
int a = 20;
tmp = doIt(str, a);
cout << tmp;
the problem with a is it doesnt return a string, it returns void, it might even work, but it's not "correct".
same for q26
mumble takes an integer argument, prints it out, increments it and returns the incremented value. so in main() its going
int x = 5;
cout << x;
tmp = mumble(x); //will print out 5 and return 5 + 1
cout << tmp; //prints 6, the return value from mumble()
the first time mumble is called (with mumble(2)) the return value is just ignored, which is ok too
Last edited:
toisthbe
Evil Member
17E as wel mate
doe
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good luck for tomorrow guys, these are some tips i have for comp exams
- take your time and read the question completely. many times comprehension of what is being asked is as hard as what they are actually asking you to do (as you no doubt discovered in the assignments) [ie working out what the question wants]
- for the long answer questions, break it into smaller problems, think about how you would solve the problem in your head, and try and break it into steps.
- for each step write some code, even if you cant remember the syntax, take question 4 of part c, even shit like
print "enter the number of minutes"
read num_mins //read in call time in minutes eg 2
print "enter the number of seconds"
read num_secs //read in the number of seconds eg 17
just comment everything so the marker knows what your doing, especially if your just writing psuedocode or a mix of psuedocode and c++. give examples of what you think inputs would be. if youre really stuck jusst write the steps in plain english. ie "id prompt the user for and read in the number of minutes and seconds. i would set the total sum to 22 cents initally, then multiply the number of minutes by 55 and add that to the sum. if the number of seconds was greater than 30 id add 110 to the total sum ... blah blah".
- go to the toilet about halfway through, even if you dont need to. just take a break and clear your mind as its easy to get overwhelmed with little details in comp exams.
- dont stress too much, its only uni
- be a time nazi, stick to the timelimits you give yourself foreach question, you might just need the 25 minutes to answer that question in part d you think you can do in 10
- take your time and read the question completely. many times comprehension of what is being asked is as hard as what they are actually asking you to do (as you no doubt discovered in the assignments
) [ie working out what the question wants]- for the long answer questions, break it into smaller problems, think about how you would solve the problem in your head, and try and break it into steps.
- for each step write some code, even if you cant remember the syntax, take question 4 of part c, even shit like
print "enter the number of minutes"
read num_mins //read in call time in minutes eg 2
print "enter the number of seconds"
read num_secs //read in the number of seconds eg 17
just comment everything so the marker knows what your doing, especially if your just writing psuedocode or a mix of psuedocode and c++. give examples of what you think inputs would be. if youre really stuck jusst write the steps in plain english. ie "id prompt the user for and read in the number of minutes and seconds. i would set the total sum to 22 cents initally, then multiply the number of minutes by 55 and add that to the sum. if the number of seconds was greater than 30 id add 110 to the total sum ... blah blah".
- go to the toilet about halfway through, even if you dont need to. just take a break and clear your mind as its easy to get overwhelmed with little details in comp exams.
- dont stress too much, its only uni
- be a time nazi, stick to the timelimits you give yourself foreach question, you might just need the 25 minutes to answer that question in part d you think you can do in 10
Last edited:
boinkBOINK
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i died miserably
redruM
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yeh i did the toilet break thing.
got stuck on problem, left it...30 mins later went to toilet, came back to same question and got it out
i went good in that exam. got everything, never know about silly mistakes, but never learnt classes, so lost few marks ther for sure.
i was very pleased....so many marks for arrays
they were like 3/4 line solutions. getting your head around nested for loops was pretty much what you needed for the exam.