CS 1063 Introduction to Computer Programming Midterm Exam 2 Section 1 Sample Exam
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1 Seat Number Name CS 1063 Introduction to Computer Programming Midterm Exam 2 Section 1 Sample Exam This is a closed book exam. Answer all of the questions on the question paper in the space provided. If you need additional space, you can ask for more paper. This is a 50-minute exam. 1) (10 points, 1 point each) Match each of the terms on the left by choosing the upper case letter of the best answer on the right and putting it next to the lower case letter in the space provided. a. iterative enhancement b. procedural decomposition c. exception d. precedence e. flow of control f. postcondition g. precondition h. public class i. public static final j. public static void A. a runtime error B. used for declaring class constants C. the order in which operators are evaluated in an expression D. the order in which statements are executed E. used to begin a class F. must be true before a method starts G. writing a program in stages H. guaranteed to be true when a method ends I. separation of tasks into subtasks J. used to begin a method 2) (10 points) Consider a method that has three parameters, an initial loan balance, an interest rate, and a monthly payment. It returns the number of months needed to pay back the loan. You do not have to write this method. a) What are the preconditions for this method? b) What are the postconditions for this method?
2 3) (10 points) Suppose that x is an double variable that has been declared and initialized. Write a code segment for each of the following: a) Print the message The value is OK if x is greater than 0 and less than 1, and print the message x is not OK otherwise. b) Print the message The value is not OK if it is not true that x is greater than 0 and less than 1.
3 4) (15 points) The following program has at least 7 errors. For each error, circle where the error occurs, label the circle with a letter: A, B, C, etc. Then for each letter, indicate how you would fix the error. import java.util.*; public class FindAverage { public static void main(string args) { console = new Scanner(); int sum; for (int i=0; i<10; i++) { System.out.println("Enter an integer"); next = console.next(); sum = sum + next; System.out.println("The average is " + sum/10);
4 5) (10 points) What is printed by executing mystery1(5) for the following: public static void mystery1(int x) { if (x < 3) { mystery2(3*x); System.out.print(23); else { System.out.print(36); mystery2(2*x); mystery2(5*x); public static void mystery2(int x) { if (x < 12) System.out.print(x); else System.out.print(x-1); 6) (10 points) Write a method that takes a Scanner as a parameter. It prompts the user to enter 10 numbers and returns the number of times a negative number was entered.
5 7) (10 points) a) Write a method called writechars which takes 2 parameters, a char and an int which prints the first parameter the number of times given by the second parameter. Do not print a new line. b) Use writechars to write the method drawbox that will print a box with a given width and height. If the parameters are 10 and 5, it will draw a box similar to the one on the right. ********** * * * * * * **********
6 8) (15 points) The table below represents the cost per pound of cashew nuts, which depends on the number of pounds purchased. Suppose that the variable, x contains the number of pounds purchased. Write a code segment that prints the total cost of the purchase in dollars. Number of pounds purchased Cost per pound under 5 $ at least 5, but less than 10 $ at least 10, but less than 50 $ 8.50 at least 50 $ 7.29
7 9) (5 points) Write the method countstring that takes has 2 String parameters. It returns the number of times the second string appears in the first string.
8 10) (5 points) In Australia, dates are often represented with the day of the month first, followed by the month name, followed by the year. For example, today would be represented by 29 October Write a method that takes a single String parameter in this format and returns the String representing the month. You may assume that a single blank separates the fields. Choose an appropriate name for the method.
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