CPS $1231$ Lab$3-3(20$ points$)$

$1.(10$ points $/2$ points each$)$ Solve the problems below using eye. Then use Eclipse to verify your

answer.

a$.$ Assuming that x is $1,$ show the result of the following Boolean expressions.

$($true$)$ && $(3>4)$

$!($x $>0)$ && $($x $>0)$

$($x $>0)||($x $<0)$

$($x $!=0)||($x $==0)$

$($x $>=0)||($x $<0)$

b$.$ Write a Boolean expression that evaluates to true if age is greater than $13$ and less than $18.$

c$.$ Write a Boolean expression for $|$x $-5|<4\mathrm{.}5($Hint: $|$x $-5|<4\mathrm{.}5$ is equivalent to $($x $5)>-4\mathrm{.}5)$ and

$($x $5)<4\mathrm{.}5$

d$.$ Rewrite the following if statements using the conditional operator.

if $($ages $>=16)$

ticketPrice $=20$;

else

ticketPrice $=10$;

e$.$ Explain what the following conditional expression does.

$($int$)($Math$.$random$()*2)==0?-1$ : $1$;

$2.(10$ points$)$ Recall from lab$3-2,$ we wrote a class, NumberToMonth, which did the following. Now,

this time, write a class called NumberToMonthUsingSwitch, that does the same but uses the switch

statement.

$$ Ask the user to enter the month of the year $($number $1$ through $12)$: $$Enter the month of the

year $-$ number $1$ to $12$

$$ Get the month using a Scanner.

$$ Checks for invalid input $($i$.$e$.,$ numbers that are not from $1$ to $12)$ and terminates the program

using System.exit$(1)$ if input is invalid.

$$ Prints the name of the month: $$The month is XXXXX