R$2\mathrm{.}11$Find at least five compile$-$time errors in the following program.

public class HasErrors

$\{$

public static void main$()$;

$\{$

System.out.print$($Please enter two numbers:$)$

x $=$ in$.$readDouble;

y $=$ in$.$readDouble;

System.out.printline$("$The sum is $"+$ x $+$ y$)$;

$\}$

$\}$

$$ R$2\mathrm{.}12$Find three run$-$time errors in the following program.

public class HasErrors

$\{$

public static void main$($String$[]$ args$)$

$\{$

int x $=0$;

int y $=0$;

Scanner in $=$ new Scanner$("$System$.$in$")$;

System.out.print$("$Please enter an integer:"$)$;

x $=$ in$.$readInt$()$;

System.out.print$("$Please enter another integer: $")$;

x $=$ in$.$readInt$()$;

System.out.println$("$The sum is $"+$ x $+$ y$)$;

$\}$

$\}$

$$ R$2\mathrm{.}13$Consider the following code segment.

double purchase $=19\mathrm{.}93$;

double payment $=20\mathrm{.}00$;

double change $=$ payment $-$ purchase;

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

The code segment prints the change as $0\mathrm{.}07000000000000028.$ Explain why. Give a recommendation to improve the code so that users will not be confused.