CS 31 Worksheet 3 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 Solutions are written in red The solutions for programming problems are not absolute it is okay if your code looks different this is just one way to solve the specific problem Concepts Switch functions a a b 2 b a 5 cout a a b b endl count int a 5 b 10 cout a a b b endl mystery a b cout a a b b endl int count 0 while count 2 1 What does the following code snippet output void mystery int a int b int main a 5 b 10 a 10 b 15 a 17 b 22 a 5 b 10 2 What does the following code snippet output int mystery char code switch code case a case b case c cout spooky break case d cout feeling break case 1 cout break case 2 cout default cout endl break return 0 int main mystery 2 mystery a mystery Z mystery d mystery 1 mystery c spooky feeling spooky 3 Consider the two programs shown below If there are no errors in the program show what will be printed by each of the following programs If there are any errors in the program explain what is wrong If not what will the output be a include iostream b include iostream using namespace std using namespace std int three int int int three int int int main int main int a b int f a 3 f 1 b 4 int i 1 cout three a b while i 5 return 0 f three i f cout f endl int three int x int y i i 1 int a return 0 a x y return a int three int a int b int z z a a b return z a 7 b 2 6 21 88 Programming Problems 1 Write a function that returns whether or not two integers are palindrome number A palindrome number is a value that reads the same forwards and backwards HINT Use and to break the value into its different digits For example intPalindrome 62 26 should return true intPalindrome 154 451 should return true intPalindrome 25 56 should return false bool intPalindrome int first int second int reverse 0 calculate the reverse of first int digit 0 do while first 0 digit first 10 reverse reverse 10 digit first first 10 return reverse second 2 Write a function checkeven which accepts 3 integer parameters and prints YES if all three numbers are even Otherwise the function prints NO Then write a main program with the statements to read in 3 integers Then call your function to determine whether the data entered was all even include iostream using namespace std void checkeven int num1 int num2 int num3 if num1 2 0 num2 2 0 num3 2 0 cout YES n else cout NO n int main int n1 n2 n3 cout Enter three numbers cin n1 n2 n3 checkeven n1 n2 n3 3 Write a function that returns the cost of mailing a package given the weight of the package in pounds and ounces and a cost per ounce are supplied as arguments to the function Recall that there are 16 ounces in a pound Then write a main program with the statements to read in the weight of a package in pounds and ounces and the cost per ounce for mailing Then call your function to calculate the mailing cost and print the mailing cost include iostream using namespace std float postage int ounces int pounds double costperounce ounces ounces pounds 16 return ounces costperounce int main int pounds ounces double ouncecost cost cout Enter package weight in pounds and ounces cin pounds ounces cout Enter mailing cost per ounce cin ouncecost cost postage ounces pounds ouncecost cout The cost to mail this package is cost endl return 0 4 Write a function that does integer division without using the division operator Return 1 if second number is 0 Your main driver code should recognize that 1 and print an error statement as shown below Then write a main program with the statements to read in 2 integers Then call your function integerDivide 6 2 should return 3 integerDivide 2 0 should return 1 and then your main program should print Error Cannot divide by 0 y iterator count return count This is a solution assumes that the parameters will be positive include iostream using namespace std int integerDivide int x int y int count 0 int iterator y if y 0 return 1 while x y int main int a b cin a b int answer integerDivide a b if answer 1 cout Error cannot divide by 0 endl else cout answer answer endl 5 Write a function that does integer multiplication without using the multiplication operator Return true if the multiplied value equals the third argument false otherwise Then write a main program with the statements to read in 3 integers Then call your function passing these three arguments HINT Perform the multiplication by repetitively using addition integerMultiply 6 2 12 should return true integerMultiply 2 0 7 should false return answer total include iostream using namespace std bool integerMultiply int x int y int answer int total 0 while x 1 total y x x 1 int main int a b c cin a b c bool answer integerMultiply a b c if answer cout a b c endl else cout a b c endl return 0