First Name: Last: ID# 1. Hexadecimal uses the symbols 1, 2, 3, 4, 5, 6, 7 8, 9, A, B, C, D, E, F,G.
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1 IST Exam1 - Fall 2015 First Name: Last: ID# PART 1. Multiple-choice / True-False (30 poinst) 1. Hexadecimal uses the symbols 1, 2, 3, 4, 5, 6, 7 8, 9, A, B, C, D, E, F,G. 2. The accessibility modifier identifies what type of value is returned when the method is completed. 3. Methods can be defined globally outside of a class in C#. 4. All data types are initialized to 0 when an object is constructed. 5. When you create an application that has two files, both must have a Main( ) method. 6. With an if statement, when you place a semicolon on the line that has the conditional expression, you create a null (empty) statement body for the true portion of the if statement. 7. Class diagrams show the data, method, and property members of a class. 8. C# performs automatic garbage collection once the loop is finished and releases any variables declared as part of the loop. 9. In C# curly braces must be added to surround all loop bodies. 10. In C# the length of an array cannot be changed. After it is instantiated with a length, dynamic resizing is not an option. 11. The type used in the foreach expression must match the array type. 12. When you use the assignment operator with an array, individual elements are copied to another memory location. 13. Collection classes are classes that enable you to store and retrieve various groups of objects. 14. In C#, you may access a two-dimensional array element using the notation [, ] or through using a double set of braces ([ ] [ ]). 15. The ternary operator (? : ) provides another way to express a simple if... selection statement. 16. After completing the program, you should compare the results produced with the desk checked calculated results. 17. Which of the following is NOT a parameter type? a. out c. ref b. in d. params
2 18. The parameter type cannot be used unless the original argument is initialized before it is sent to the method. a. ref c. out b. in d. params public static int Abs(int) 19. Which of the following would be a valid call to the above method? a. answer = Abs(-23); c. answer = Math.Abs(-23) b. answer = int Math.Abs(-23) d. answer = int Abs(-23) 20. A class is normally associated with a(n), which often describes a person, place, or thing and is normally a noun. a. method member c. data member b. behavior d. entity 21. perform differently based on their operands. a. Overloaded operators c. Boolean operators b. Conditional expressions d. Relational operators if (a > 10) if (b > 10) if (c > 10) result = 1; if (b > 100) result = 2; result = 3; result = 4; result = 5; 22. What is stored in result when a, b and c are equal to 200? a. 1 c. 3 b. 2 d An example for statement that has a compound initialization, compound test and compound update could be written as. a. for (int r = 0; c = 5; r < 3 && c > 2; r++; c--) b. for (int r = 0; c = 5; r < 3 ; c > 2; r++; c--) c. for (int r = 0, c = 5; r < 3, c > 2; r++, c--) d. for (int r = 0, c = 5; r < 3 && c > 2; r++, c--) 24. int [ ] score = {86, 66, 76, 92, 95, 88}; for (int i = score.length-1; i > -1; i--) { total += score[i]; } Using the declaration above for score, what is added to total during the first iteration?
3 a. 0 c. 86, 66, 76, 92 and 95 b. 88 d. unknown, because i is not initialized 25. What happens when you assign one array to another using the assignment operator? a. An error message is generated. b. Elements are copied to new memory locations. c. Both arrays become value type data elements. d. Both arrays reference the same memory locations. 26. Which of the following is a valid example of calling a method and sending it a two-dimensional array argument? a. DisplayArrayContents(int [, ] anarray); b. DisplayArrayContents(anArray); c. DisplayArrayContents(anArray[10, 2]); d. DisplayArrayContents(int [10, 2] anarray); 27. One of the properties of the ArrayList class is. It Gets or sets the number of elements that the ArrayList can contain. a. Length c. Rank b. Capacity d. Count 28. C# has two types of string literals. string literals are called. a. quoted string literal c. actual string literal b. at string literal d. verbatim string literal string [, ] name = new string [2, 3] {{ Alex, Ben, Cay }, { Jose, Tyne, Yin }}; 29. Looking above, what does name[0, 1] reference? a. l c. Alex b. Ben d. Al 30. Which of the following returns the number of columns in a two-dimensional array? a. Rank c. GetLength(1) b. GetLength(0) d. GetLength 31. Which of the following is an example of a collection class? a. Array c. HashTable b. Queue d. all of the above 32. With the while loop, the body of the loop is. a. always performed at least one time b. performed as long as the conditional expression evaluates to true c. must produce a boolean result d. must be enclosed in curly braces 33. Instead of requiring that a dummy value be entered after all values are processed, a -controlled loop initializes a variable on the outside of the loop and then evaluates the variable to see when it changes values. Its value is changed inside the loop body when the loop should exit. a. counter c. state b. sentinel d. change
4 Part 2. C# Programming (20 points) Write a C# method that accepts an array of integers and returns to the caller both, the value of the largest number in the array and the number of times that it appears in the array. For example consider the array {11, 22, 10, 22, 7, 22, 14}. If this collection is given to your method, it has to indicated that for this sample 22 is the largest value and it occurs 3 times. HINT: use ref or out parameters.
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7 ist311-exam1-fall2015 Answer Section 1. ANS: F PTS: 1 REF: ANS: F PTS: 1 REF: ANS: F PTS: 1 REF: ANS: F PTS: 1 REF: ANS: F PTS: 1 REF: ANS: T PTS: 1 REF: ANS: F PTS: 1 REF: ANS: T PTS: 1 REF: ANS: F PTS: 1 REF: ANS: T PTS: 1 REF: ANS: T PTS: 1 REF: ANS: F PTS: 1 REF: ANS: T PTS: 1 REF: ANS: F PTS: 1 REF: ANS: T PTS: 1 REF: ANS: T PTS: 1 REF: ANS: B PTS: 1 REF: ANS: A PTS: 1 REF: ANS: C PTS: 1 REF: ANS: D PTS: 1 REF: ANS: A PTS: 1 REF: ANS: A PTS: 1 REF: ANS: D PTS: 1 REF: ANS: B PTS: 1 REF: ANS: D PTS: 1 REF: ANS: B PTS: 1 REF: ANS: D PTS: 1 REF: ANS: D PTS: 1 REF: ANS: B PTS: 1 REF: ANS: C PTS: 1 REF: ANS: D PTS: 1 REF: ANS: B PTS: 1 REF: ANS: C PTS: 1 REF: 332
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