Q$2\mathrm{.}2$

$3$ PointsGrading comment:

Why is converting a value of a smaller type to a value of a larger type $($i$.$e$.,$ a $\backslash "$widening$\backslash "$ conversion$)$ considered $\backslash "$safer$\backslash "$ than the converse $($a $\backslash "$narrowing$\backslash "$ conversion$)?$

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Q$2\mathrm{.}3$

$3$ PointsGrading comment:

If we know that boolean A is false but do not know if boolean B is true or false, then:

We do know A && B is false...

$...$but we do not know whether B $||$ A is true or false.

Please briefly explain why this is so:

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Q$2\mathrm{.}4$

$3$ PointsGrading comment:

Which of the three types of loops $($while$,$ do$-$while, and for$)$ is best suited for working with arrays?

Grading comment:

Why?

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Q$3$

$10$ PointsGrading comment:

For each of the following, indicate if it is a valid Java identifier or not. $($An identifier is any word you use in a program, not just a variable name.$)$

If it is valid, explain what it would identify using the normal naming conventions.

If it is not valid, explain why it is not valid.

Q$3\mathrm{.}1$

$2$ PointsGrading comment:

nine

Valid?

Choice $1$ of $2$:YesChoice $2$ of $2$:No

Grading comment:

Explanation:

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Q$3\mathrm{.}2$

$2$ PointsGrading comment:

Product

Valid?

Choice $1$ of $2$:YesChoice $2$ of $2$:No

Grading comment:

Explanation:

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Q$3\mathrm{.}3$

$2$ PointsGrading comment:

this~other

Valid?

Choice $1$ of $2$:YesChoice $2$ of $2$:No

Grading comment:

Explanation:

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Q$3\mathrm{.}4$

$2$ PointsGrading comment:

MAXIMUM

Valid?

Choice $1$ of $2$:YesChoice $2$ of $2$:No

Grading comment:

Explanation:

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Q$3\mathrm{.}5$

$2$ PointsGrading comment:

$92$ndStreet

Valid?

Choice $1$ of $2$:YesChoice $2$ of $2$:No

Grading comment:

Explanation:

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Q$4$

$10$ PointsGrading comment:

Q$5\mathrm{.}3$

$2$ PointsGrading comment:

System.out.println$(($iVar$1/$iVar$2)>($iVar$2\%$iVar$1))$;

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Q$5\mathrm{.}4$

$2$ PointsGrading comment:

System.out.println$($ s$2.$length$()+$ s$1+$ dVar$2)$;

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Q$5\mathrm{.}5$

$2$ PointsGrading comment:

System.out.println$(($int$)($dVar$2/$ s$1.$length$()))$;

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Q$5\mathrm{.}6$

$2$ PointsGrading comment:

System.out.println$($ s$2+\backslash "$ is $\backslash "+$ iVar$2*$ dVar$2)$;

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Q$6$

$12$ PointsGrading comment:

Examine the following code snippets:

import java.util.Random;

$//$ Other code...

Random rGen $=$ new Random $()$;

boolean b$1=$ rGen.nextBoolean $()$; $//$ Could be either true OR false

int int$1=5,$ int$2=10$;

String s $=\backslash "$amenable$\backslash "$;

Indicate the whether the indicated lines execute or not:

Line #$01$: if $(($int$2<=$ int$1)$ && b$1)$

Line #$02$: System.out.println$(\backslash "$a$\backslash ")$;

Line #$03$: else

Line #$04$: System.out.println$(\backslash "$b$\backslash ")$;

Line #$05$: if $($b$1||($int$1*$ int$2>=$ s$.$length$()))$

Line #$06$: System.out.println$(\backslash "$c$\backslash ")$;

Line #$07$:

Line #$08$: switch $(($int$)$ Math.pow$($int$2,$ int$1)/--$int$1)\{$

Line #$09$: case $10000$:

Line #$10$: System.out.println$(\backslash "$d$\backslash ")$;

Line #$11$: break;

Line #$12$: case $25000$:

Line #$13$: System.out.println$(\backslash "$e$\backslash ")$;

Line #$14$: break;

Line #$15$: case $50000$:

Line #$16$: System.out.println$(\backslash "$f$\backslash ")$;

Line #$17$: break;

Line #$18$: $\}$

Answer at least $5$ of the following $6$ correctly, indicating whether or not the specified line will execute:

Q$6\mathrm{.}1$

$2$ PointsGrading comment:

Line #$02$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$6\mathrm{.}2$

$2$ PointsGrading comment:

Line #$04$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$6\mathrm{.}3$

$2$ PointsGrading comment:

Line #$06$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$6\mathrm{.}4$

$2$ PointsGrading comment:

Line #$10$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$6\mathrm{.}5$

$2$ PointsGrading comment:

Line #$13$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$6\mathrm{.}6$

$2$ PointsGrading comment:

Line #$16$:

Choice $1$ of $2$:YesChoice $2$ of $2$:No

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Q$7$

$10$ PointsGrading comment:

Loops:

Examine the following code:

for $($int i $=5$; i $>=1$; i$--)\{$

System.out.print$(\backslash "<<\backslash ")$;

for $($int j $=5$; j $>=1$; j$--)$

System.out.print$(($i $*$ j$)\%2==0?\backslash "-\backslash "$ : $\backslash "*\backslash ")$;

System.out.println$(\backslash ">>\backslash ")$;

$\}$

Q$7\mathrm{.}1$

$4$ PointsGrading comment:

Illustrate what would print:

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Q$7\mathrm{.}2$

$3$ PointsGrading comment:

Which lines of output have no dash characters?

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Q$7\mathrm{.}3$

$3$ PointsGrading comment:

Why is this the case?

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Q$8$

$10$ PointsGrading comment:

Arrays:

For each part, write the line$($s$)$ of code required to achieve the specified tasks...

Q$8\mathrm{.}1$

$2$ PointsGrading comment:

Declare and initialize a String array $($call it $\backslash "$names$\backslash ")$ of size $4$:

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Q$8\mathrm{.}2$

$2$ PointsGrading comment:

Declare and initialize another String array $($call it $\backslash "$greetings$\backslash "),$ which will contain the predetermined values $\backslash "$hey$\backslash ",\backslash "$hello$\backslash ",\backslash "$howdy$\backslash ",$ and $\backslash "$greetings$\backslash ".$

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Q$8\mathrm{.}3$

$3$ PointsGrading comment:

Fill names array with strings for any people's names you like.

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Q$8\mathrm{.}4$

$3$ PointsGrading comment:

Write a loop that will print a greeting from greetings followed by a comma and space, followed by the corresponding name $($i$.$e$.,$ matching indices in the arrays$)$ from names $($on a separate line for each greeting$/$name pair$).$

For example: hello, Tracy

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