CMPSC 200 Final Exam Questions With Correct Answers

CMPSC 200 Final Exam Questions With
Correct Answers

Issue with trying to time computer code runs - CORRECT ANSWER✔✔-run times
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can vary from run to run; operating system can make adjustments to the system
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clock--so using the system clock for timing is difficult
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Data types from least to most storage - CORRECT ANSWER✔✔-
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singe<complex=double


~= - CORRECT ANSWER✔✔-not equal
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sparse matrix - CORRECT ANSWER✔✔-most elements are zero
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Storage order for field names (structure arrays) - CORRECT ANSWER✔✔-in order
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of creation
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x = [4 3] - CORRECT ANSWER✔✔-x~=3
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x~=4


Flow chart characteristics - CORRECT ANSWER✔✔-it is a graphical representation
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of how computer code flows or progresses, and it is constructed with well-
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defined conventions |

,continue - CORRECT ANSWER✔✔-skips the rest of the current loop iteration,
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advances to the next loop pass | | | | |




short circuit evaluation - CORRECT ANSWER✔✔-When checking logic, you do not
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evaluate the other terms if you find you do not have to; only with scalars, &&,
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and || |




do while - CORRECT ANSWER✔✔-not in MATLAB; guaranteed to run at least once
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units of information used to store 1 logical variable - CORRECT ANSWER✔✔-bit
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while loop vs for loop - CORRECT ANSWER✔✔-use while loop when you can only
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know after the fact how many times the loop will need to execute
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solving linear equations - CORRECT ANSWER✔✔-option 1: x = A\b
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option 2: x = inv(A)*b | | | |




option 3: aug_A = [A b] | | | | |




reduced_echelon_form = rref(aug_A) | |




x = reduced_echelon_form(:, end)
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Tic and toc - CORRECT ANSWER✔✔-how much wall time has elapsed for a code
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to run
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Memory used to store a dense 100x100 matrix of single precision floating point
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numbers - CORRECT ANSWER✔✔-=100*100*8*.5 KB
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, Sentinel loop - CORRECT ANSWER✔✔-terminates when a certain condition is met
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(sentinel condition)
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code vectorization - CORRECT ANSWER✔✔-uses vector operations instead of
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element-element loop-based operations | |




computer code categories - CORRECT ANSWER✔✔-1: sequences
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2: selection structures
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3: repetition structures
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completely remove last cell of a cell array C - CORRECT ANSWER✔✔-C{end} = []
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Valid for loop index - CORRECT ANSWER✔✔-a scalar, vector, or matrix
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if MATLAB finds a true case in a switch, it will continue checking the other cases -
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CORRECT ANSWER✔✔-false |




An exclusive or evaluates as false when either inputs A or B (but not both) are
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non-zero - CORRECT ANSWER✔✔-false
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The ' operator and the transpose command both compute transposes but these
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two techniques do not behave identically under all circumstances - CORRECT
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ANSWER✔✔-true