CSE 142 Sample Midterm Exam 3 1 Expressions 10 points 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 Expression Value 1 2 3 4 5 5 2 9 0 2 0 2 1 25 29 2 5 34 3 8 6 2 4 0 2 5 31 2 10 0 10 5 2 0 2 Parameter Mystery 20 points At the bottom of the page write the output produced by the following program as it would appear on the console public class ParameterMystery public static void main String args String a felt String b saw String c drew String saw sue String drew b mystery a b c mystery b a saw mystery drew c saw mystery a saw drew mystery a a drew public static void mystery String b String a String c System out println c a the b 1 of 6 3 While Loop Simulation 15 points For each call below to the following method write the output that is printed as it would appear on the console public static void mystery int a int b while b 0 if a b System out print a a a b else System out print b b b a System out println a Method Call Output mystery 42 0 mystery 6 12 mystery 18 27 mystery 24 60 mystery 50 15 2 of 6 4 Assertions 15 points For each of the five points labeled by comments identify each of the following assertions as being either always true never true or sometimes true sometimes false public static int assertions int n int x 2 Point A while x n Point B if n x 0 n n x x 2 Point C else x Point D Point E return n Fill in each box of the the table below with one of the following words ALWAYS NEVER or SOMETIMES You may abbreviate these choices as A N and S as long as you write legibly x 2 x n n x 0 Point A Point B Point C Point D Point E 3 of 6 5 Programming 15 points Write a static method named enoughTimeForLunch that accepts four integers hour1 minute1 hour2 and minute2 as parameters Each pair of parameters represents a time on the 24 hour clock for example 1 36 PM would be represented as 13 and 36 The method should return true if the gap between the two times is long enough to eat lunch that is if the second time is at least 45 minutes after the first time Otherwise the method should return false You may assume that all parameter values are valid the hours are both between 0 and 23 and the minute parameters are between 0 and 59 You may also assume that both times represent times in the same day e g the first time won t represent a time today while the second time represents a time tomorrow Note that the second time might be earlier than the first time in such a case your method should return false Here are some example calls to your method and their expected return results Call enoughTimeForLunch 11 enoughTimeForLunch 12 enoughTimeForLunch 12 enoughTimeForLunch 14 enoughTimeForLunch 12 enoughTimeForLunch 12 Value Returned 00 30 30 20 30 00 11 59 13 00 13 15 17 02 9 30 11 55 true false true true false false 4 of 6 6 Programming 15 points Write a static method named printGrid that accepts two integer parameters rows and cols The output is a commaseparated grid of numbers where the first parameter rows represents the number of rows of the grid and the second parameter cols represents the number of columns The numbers count up from 1 to rows x cols The output are displayed in column major order meaning that the numbers shown increase sequentially down each column and wrap to the top of the next column to the right once the bottom of the current column is reached Here are some example calls to your method and their expected results Call Output printGrid 3 1 4 7 10 2 5 8 11 3 6 9 12 6 13 16 14 17 15 18 printGrid 5 3 1 6 11 2 7 12 3 8 13 4 9 14 5 10 15 printGrid 4 1 1 2 3 4 printGrid 1 3 1 2 3 You may assume that both parameters passed to your method are greater than 0 5 of 6 7 Programming 10 points 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 of input as their response to each prompt Your code should be case sensitive for example if the favorite letter is lowercase a you should not stop prompting if the user types words that start with an uppercase 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 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 6 of 6
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