CSE 142 Sample Midterm Exam 1 1 Expressions For each expression in the left hand column indicate its value in the right hand column Be sure to list a constant of appropriate type e g 7 0 rather than 7 for a double Strings in quotes true false for a boolean Expression Value 3 4 5 6 7 2 1 5 2 0 5 5 2 5 4 23 5 31 4 3 17 16 10 1 2 3 4 5 6 7 8 9 345 10 3 55 5 6 10 5 2 0 1 2 0 4 9 5 1 1 1 1 1 of 8 2 Parameter Mystery At the bottom of the page write the output produced by the following program public class ParameterMystery public static void main String args String x java String y tyler String z tv String rugby hamburger String java donnie hamburger x y z hamburger z x y hamburger rugby z java hamburger y rugby x hamburger y y java public static void hamburger String y String z String x System out println z and x like y 2 of 8 3 If Else Simulation For each call of the method below write the value that is returned public static int mystery int a int b int c if a b c a else if b a 0 c b else c b a b a return c Method Call Value Returned mystery 4 2 mystery 5 4 mystery 5 13 mystery 5 17 mystery 4 8 3 of 8 4 While Loop Simulation For each call of the method below write the output that is printed public static void mystery int i int j while i 0 j 0 i i j j j 1 2 System out print i j System out println i Method Call Output mystery 5 0 mystery 3 2 mystery 16 5 mystery 80 9 mystery 1600 40 4 of 8 5 Assertions For the following method identify each of the three assertions in the table below as being either ALWAYS true NEVER true or SOMETIMES true sometimes false at each labeled point in the code You may abbreviate these choices as A N S respectively public static int mystery int x int y 1 int z 0 Point A while y x Point B y y 10 z Point C Point D z Point E return z y x z 0 z 0 Point A Point B Point C Point D Point E 5 of 8 6 Programming Write a static method named hasMidpoint that accepts three integers as parameters and returns true if one of the integers is the midpoint between the other two integers that is if one integer is exactly halfway between them Your method should return false if no such midpoint relationship exists The integers could be passed in any order the midpoint could be the 1st 2nd or 3rd You must check all cases Calls such as the following should return true hasMidpoint 4 6 8 hasMidpoint 2 10 6 hasMidpoint 8 8 8 hasMidpoint 25 10 5 Calls such as the following should return false hasMidpoint 3 1 3 hasMidpoint 1 3 1 hasMidpoint 21 9 58 hasMidpoint 2 8 16 6 of 8 7 Programming Write a static method named sequenceSum that prints terms of the following mathematical sequence 1 1 1 1 1 1 2 3 4 5 6 also written as i 1 1 i Your method should accept a real number as a parameter representing a limit and should add and print terms of the sequence until the sum of terms meets or exceeds that limit For example if your method is passed 2 0 print terms until the sum of those terms is at 2 0 You should round your answer to 3 digits past the decimal point The following is the output from the call sequenceSum 2 0 1 1 2 1 3 1 4 2 083 Despite the fact that the terms keep getting smaller the sequence can actually produce an arbitrarily large sum if enough terms are added If your method is passed a value less than 1 0 no output should be produced You must match the output format shown exactly note the spaces and pluses separating neighboring terms Other sample calls Calls Output sequenceSum 0 0 sequenceSum 1 0 1 1 000 sequenceSum 1 5 1 1 2 1 500 Call Output sequenceSum 2 7 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 2 718 7 of 8 8 Programming Write a static method named favoriteLetter that accepts two parameters a Scanner for the console and a favorite letter represented as a one letter String The method repeatedly prompts the user until two consecutive words are entered that start with that letter The method then prints a message showing the last word typed You may assume that the user will type a single word response to each prompt Your code should be case sensitive for example if the favorite letter is a you should not stop prompting if the user types words that start with an A For example the following logs represent the output from two calls to your method User input is underlined Call Output Scanner console new Scanner System in favoriteLetter console y Looking for two y words in a row Type a word hi Type a word bye Type a word yes Type a word what Type a word yellow Type a word yippee y is for yippee Scanner console new Scanner System in favoriteLetter console A Looking for two A words in a row Type a word I Type a word love Type a word CSE142 Type a word AND Type a word PROGRAMS Type a word are Type a word always Type a word Absolutely Type a word Awesome A is for Awesome 8 of 8
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