in java

$4\mathrm{.}22($Tabular Output$)$ Write a Java application that uses looping to print the following table of values:

N $10*$N $100*$N $1000*$N

$1101001000$

$2202002000$

$3303003000$

$4404004000$

$5505005000$

$4\mathrm{.}23($Find the Two Largest Numbers$)$ Using an approach similar to that for Exercise $4\mathrm{.}21,$ find the two largest values of the $10$ values entered. $[$Note: You may input each number only once.$]$

$4\mathrm{.}24($Validating User Input$)$ Modify the program in Fig. $4\mathrm{.}12$ to validate its inputs. For any input, if the value entered is other than $1$ or $2,$ keep looping until the user enters a correct value.

$4\mathrm{.}25$ What does the following program print?

$1//$ Exercise $4\mathrm{.}25$: Mystery$2.$java

$2$ public class Mystery$2\{$

$3$ public static void main$($String$[]$ args$)\{$

$4$ int count $=1$;

$5$

$6$ while $($count $<=10)\{$

$7$ System.out.println$($count $\%2==1?"****"$ : $"++++++++")$;

$8++$count;

$9\}$

$10\}$

$11\}$

$4\mathrm{.}26$ What does the following program print?

$1//$ Exercise $4\mathrm{.}26$: Mystery$3.$java

$2$ public class Mystery$3\{$

$3$ public static void main$($String$[]$ args$)\{$

$4$ int row $=10$;

$5$

$6$ while $($row $>=1)\{$

$7$ int column $=1$;

$8$

$9$ while $($column $<=10)\{$

$10$ System.out.print$($row $\%2==1?"<"$ : $">")$;

$11++$column;

$12\}$

$13$

$14--$row;

$15$ System.out.println$()$;

$16\}$

$17\}$

$18\}$

$4\mathrm{.}27($Dangling$-$else Problem$)$ The Java compiler always associates an else with the immediately preceding if unless told to do otherwise by the placement of braces $(\{$ and $\}).$ This behavior can lead to what is referred to as the dangling$-$else problem. The indentation of the nested statement

$1$ if $($x $>5)$

$2$ if $($y $>5)$

$3$ System.out.println$("$x and y are $>5")$;

$4$ else

$5$ System.out.println$("$x is $<=5")$;

appears to indicate that if x is greater than $5,$ the nested if statement determines whether y is also greater than $5.$ If so$,$ the statement outputs the string $"$x and y are $>5".$ Otherwise, it appears that if x is not greater than $5,$ the else part of the if$...$else outputs the string $"$x is $<=5".$ Beware! This nested if$...$else statement does not execute as it appears. The compiler actually interprets the statement as

$1$ if $($x $>5)$

$2$ if $($y $>5)$

$3$ System.out.println$("$x and y are $>5")$;

$4$ else

$5$ System.out.println$("$x is $<=5")$;

in which the body of the first if is a nested if$...$else. The outer if statement tests whether x is greater than $5.$ If so$,$ execution continues by testing whether y is also greater than $5.$ If the second condition is true, the proper string$"$x and y are $>5"$is displayed. However, if the second condition is false, the string $"$x is $<=5"$ is displayed, even though we know that x is greater than $5.$ Equally bad, if the outer if statement$$s condition is false, the inner if$...$else is skipped and nothing is displayed. For this exercise, add braces to the preceding code snippet to force the nested if$...$else statement to execute as it was originally intended.

$4\mathrm{.}28($Another Dangling$-$else Problem$)$ Based on the dangling$-$else discussion in Exercise $4\mathrm{.}27,$ state the output for each of the following code segments when x is $9$ and y is $11$ and when x is $11$ and y is $9.$ We eliminated the indentation from the following code to make the problem more challenging. $[$Hint: Apply the indentation conventions you$$ve learned.$]$

$1$ if $($x $<10)$

$2$ if $($y $>10)$

$3$ System.out.println$("*****")$;

$4$ else

$5$ System.out.println$("$#####$")$;

$6$ System.out.println$("$$$$$$$")$;

$7$ if $($x $<10)\{$

$8$ if $($y $>10)$

$9$ System.out.println$("*****")$;

$10\}$

$11$ else $\{$

$12$ System.out.println$("$#####$")$;

$13$ System.out.println$("$$$$$$$")$;

$14\}$

$4\mathrm{.}29($Another Dangling$-$else Problem$)$ Based on the dangling$-$else discussion in Exercise $4\mathrm{.}27,$ modify the following code to produce the output shown. Use proper indentation techniques. You must not make any additional changes other than inserting braces and changing the code$$s indentation. We$$ve eliminated the indentation from the following code to make the problem more challenging. $[$Note: It$$s possible that no modification is necessary.$]$

$1$ if $($y $==8)$

$2$ if $($x $==5)$

$3$ System.out.println$("$@@@@@$")$;

$4$ else

$5$ System.out.println$("$#####$")$;

$6$ System.out.println$("$$$$$$$")$;

$7$ System.out.println$("$&&&&&$")$;