Introduction to Computer Science Midterm 3 Fall, Points

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1 Introduction to Computer Science Fall, Points Notes 1. Tear off this sheet and use it to keep your answers covered at all times. 2. Turn the exam over and write your name next to the staple. Do not put your name anywhere else on the exam. 3. To receive full credit, show all your work. 4. You are graded not only on the correct answer, but also the most efficient answer. 5. Read all the questions before you begin. 6. The use of calculators is not allowed. 7. You may have three 8½ 11 sheets of notes for use on the test. 8. If you have questions about the test, please come and ask me. 9. If a question has a syntax error, that is not the answer to the question. Syntax errors are unintentional.

2 1. (2 points) An array's size declarator must be a with a value greater than. a. number, one b. number, zero c. constant integer expression, zero d. variable, -1 e. None of these 2. (2 points) Subscript numbering in C++ a. can be set at runtime. b. can begin with a programmer-defined value. c. varies from program to program. d. automatically begins with zero. 3. (2 points) To assign the contents of one array to another, you must use the a. assignment operator. b. equality operator. c. array names. d. All of these. 4. (2 points) An array that holds 5 names with 20 characters in the name would be declared using the statement. a. char names[5][20]; b. char names[20][5]; c. char names[21][5]; d. char names[5][21]; 5. (2 points) Sorted data is always ordered: a. from lowest to highest value. b. from highest to lowest value. c. using a binary sort algorithm. d. using a linear sort algorithm. 6. (2 points) A(n) search uses a loop to sequentially step through an array. a. binary b. unary c. linear d. relative Page 1

3 7. (2 points) The is adequate for searching through small arrays. a. binary search b. linear search c. unary search d. bubble sort 8. (2 points) The statement cout << &num1; outputs a. the value stored in the variable called num1. b. the memory address of the variable called num1. c. the number 1. d. the string "&num1". 9. (2 points) Not all arithmetic operations may be performed on pointers. For example, you cannot or a pointer. a. multiply, divide b. add, subtract c. +=, -= d. increment, decrement 10. (2 points) Dynamic memory allocation occurs a. when a new variable is created by the compiler. b. when a new variable is created during runtime. c. when a pointer fails to dereference the right variable. d. when a pointer is assigned an incorrect address. 11. (2 points) If dynamically allocated memory is not freed, a. it cannot be used again until after the computer has been restarted. b. it results in a compiler error. c. a runtime error informs your user that the program did not free memory space. d. the source code will not link correctly Page 2

4 12. (10 points) Consider a 2-by-3 integer array named t. a. Write a declaration for t. b. How many columns does t have? c. Write a single statement that sets the element of t in row 1 and column 2 to 3. d. Write nested for loops that initializes each element of t to zero. 13. (10 points) For each of the following, write a single statement that performs the indicated task. Assume that integer variables value1 and value2 have been declared and that value1 has been initialized to a. Declare the variable lptr to be a pointer to an object of type int. b. Assign the address of variable value1 to the pointer variable lptr. c. Print the value of the object pointed to by lptr. d. Assign the value of the object pointed to by lptr to variable value2. e. Print the address of value2. Page 3

5 14. (10 points) An array contains the elements shown below. The last two elements have been sorted using a bubble sort. What would be the value of the elements in the array after two more passes of the bubble sort algorithm? (10 points) An array contains the elements shown below. The first two elements have been sorted using insertion sort. What would be the value of the elements in the array after two more passes of the insertion sort algorithm? (12 points) Given the following declarations and definitions char a[20] = { 'z', 'x', 'm', 's', 'e', 'h' }; int i = 2; int j = 4; write pointer expressions that evaluate to the same value as each of the following. You may not use subscripts. a. a[0] b. The address of the last element in a. c. The next element after a[3]. d. The next element after a[j]. Page 4

6 17. (26 points) Write a function named Statistics. This function receives as a parameter an integer array of test scores and an integer that gives the number of test scores in the array. Statistics should calculate and return the median and the mode of these test scores. Once the scores are in ascending order, if the size of the array is odd, the median is the middle score; if the size of the array is even, the median is the average of the two middle scores. The mode is the score that occurs the most often. For example, assume that the array contained the following scores (once it is put into ascending order): The median is 77 and the mode is 94. If necessary, you may assume you have available a function that does a selection sort whose prototype is: void selectionsort( int [], int); Page 5

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