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1. In one or two sentences, explain each of the following concepts. BE BRIEF; overly long answers will be grounds for mark deductions. (a) Off-by-one error

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Nestor Rutherford
Nestor RutherfordLv2
28 Mar 2018
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3. Consider the following method, which returns the number of times the parameter String word occurs in the parameter array wordArray: public static int countOccurrences (String[] wordArray, String word) { int result; result = 0; for (int i = 0; i < wordArray.length; i++) { if (wordArray[i] == word) { result = result + 1; return result; Unfortunately, the above method contains a bug. This bug causes the method to return 0 instead of the expected value of 2 when it is called in the following code fragment: String[] animalism = { new String ("four"), new String ("legs"), new String ("good"), new String ("two"), new String ("legs"), new String ("bad") }; int count = count Occurrences (animalism, "legs"); System.out.println("Number of occurrences: " + count); Describe what the problem is, and suggest a simple way to fix it. BE BRIEF; overly long answers will be grounds for mark deductions.

Type of Errors For each of the following answer whether they would cause an compiler error, runtime error, or a bug. In other cases the mentioned error may not cause a problem for the computer and is merely a question of style. In this case you should choose "Style" In other cases the question may not cause a problem at all in which case you should answer "No Error" For the purpose of this question, you can use the following definitions: • Compiler error : An error that occurs during the compilation phase of your development. In this case no class file is produced. • Runtime error: An error that occurs while you are running your program. Your program starts to execute but terminates before the main method has finished executing. • Logical error or bug : An error that results in the wrong results being seen • Style error: The error does not make a difference to the computer but is something that may be considered bad code. 7. Omitting a semi-colon at the end of a variable assignment. (A) Compiler Error (B) Bug (logical) Error (C) Style (D) Runtime Error (E) No Error

I. [10 marks For each row in the table below, determine what would happen if you opened DrScheme and tried to evaluate the given code. If there is an error, brielly explain what is wrong (be more specific than saying "invalid Scheme expression"). If there is no error, give the value produced by DrScheme. The first two rows have been completed for you as examples. Answer Scheme Code (+ 12) (+ 1 2)) (7 + 12) Error. There is an extra) (+ 4 (* 1 (+ 4 2))) ( 1 ((reraircer 27 9) (sqr 5))) (/ 10 (-3 (-14))) (= 'apple 'banana) (and (< 3 4) 19 10)) (- 12 (string-length. "iya")) (reso rest (rest (rest (cors'a (cons 3 (cons 5 empty))))))) (cond [(> 3 8) "happy! [(-34) 'sad) [(even? 9) 'oops] ) (posn-X (first (rest (coris (make-posn 3 4) (cons (make-posr. 56) empty)))))

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