CS 31 Worksheet 4 Solutions This worksheet is entirely optional and meant for extra practice Some problems will be more challenging than others and are designed to have you apply your knowledge beyond the examples presented in lecture discussion or projects All exams will be done on paper so it is in your best interest to practice these problems by hand and not rely on a compiler Concepts Functions Parameter Passing Arrays 1 Show what will be printed by each of the following programs a include iostream h void doglobal void dolocal void doref int void doval int int x int main x 15 doref x cout x x after the call to doref n x 16 doval x cout x x after the call to doval n x 17 dolocal cout x x after the call to dolocal n x 18 doglobal cout x x after the call to doglobal n return 0 void doref int a a 3 void doval int b b 4 void dolocal int x x 5 void doglobal x 7 a x 3 after the call to doref x 16 after the call to doval x 17 after the call to dolocal x 7 after the call to doglobal b include iostream h int num 10 void one void two int void three void four int void five int int main int num 1 cout At start of main num num endl one cout After call to one num num endl two num cout After call to two num num endl three cout After call to three num num endl four num cout After call to four num num endl two num cout After call to two num num endl one cout After call to one num num endl five num cout After call to five num num endl one cout After call to one num num endl void one cout At the start of one num num endl num 50 cout At the end of one num num endl void two int num cout At the start of two num num endl num 5 cout At the end of two num num endl void three int num 100 cout At the start of three num num endl num 200 cout At the end of three num num endl void four int num cout At the start of four num num endl num 25 cout At the end of four num num endl void five int i cout At the start of five num num endl num 2 i 3 cout At the end of five num num endl b At the start of main num 1 At the start of one num 10 At the end of one num 50 After call to one num 1 At the start of two num 1 At the end of two num 5 After call to two num 1 At the start of three num 100 At the end of three num 200 After call to three num 1 At the start of four num 1 At the end of four num 25 After call to four num 25 At the start of two num 25 At the end of two num 5 After call to two num 25 At the start of one num 50 At the end of one num 50 After call to one num 25 At the start of five num 50 At the end of five num 2 After call to five num 3 At the start of one num 2 At the end of one num 50 After call to one num 3 c include iostream h void triple int int main void int x for x 1 x 5 x triple x void triple int value static int total 0 int answer answer 3 value total answer cout value answer endl cout total total endl endl c 1 3 total 3 2 6 total 9 3 9 total 18 4 12 total 30 5 15 total 45 2 Declare a function named scan that reviews an array of int and returns the largest and smallest number found in the array HINT 1 You ll need to pass an array argument and a companion size parameter HINT 2 Since you are returning more than one value from your function you ll need to use reference parameters Implement this function and then write statements to call this function with an array of size 5 2 void scan int array int size int largest int smallest void scan int array int size int largest int smallest if size 0 largest array 0 to start with smallest array 0 for int i 0 i size i int value array i if value max max value if value min min value int main int values 5 1 2 3 4 5 Int big small scan values 5 big small return 0 3 What is the output of the following program include iostream h int main int a 100 b 100 j m int suma 0 sumb 0 sumdiff 0 cin m for j 0 j m j cin a j b j suma suma a j sumb b j sumdiff sumdiff a j b j for j m 1 j 0 j cout a j b j a j b j endl cout suma sumb sumdiff endl DATA 5 11 15 19 14 4 2 17 6 1 3 3 1 3 2 17 6 11 4 2 2 19 14 5 11 15 4 52 40 12 int h 6 p 2 m 3 int values 7 values m values h values p values m 4 Given Suppose values contains 4 0 2 6 2 1 14 Show the contents of the array values after for m 5 m 4 4 0 2 26 10 12 14 5 Given the declarations int sample 8 i k show the contents of the array sample after the following code is executed Use a question mark to indicate any garbage values in the array for k 0 k 8 k if k 2 sample k 1 5 subscript 0 1 2 3 4 5 6 7 value 1 1 1 1 6 What is the error in the following program segment int main int i count 10 cout please enter 10 numbers for i 1 i 10 i cin count i 6 This is a logical error It will not result in an error message from the compiler but may result in a run time error The array has subscripts that run from 0 through 9 but the loop reads into array locations 1 through 10 Storing a value into count 10 will either overwrite another variable or some code in this program or will access memory allocated to a different program which will cause this program to terminate execution 7 Write the statements to multiply every element of an array of ints of size 50 by 2 7 for i 0 i 50 i nums i nums i 2 8 Write the statements to add up those elements of an array of ints of size 25 which have an even subscript 8 for sum 0 …