using java, Sometimes numbers are converted to words, like in a wedding invitation. So $23$ becomes "twenty three". Write a method digitToWord$()$ that takes a single digit number from $0-9$ and returns that number's word: $0$ is zero, $1$ is one, $2$ is two, etc $($if the number is outside $0-9,$ return "error"$).$ Write another method tensDigitToWord$()$ that takes a single digit number from $2-9,$ and returns that number's word when it appears in the tens digit: $2$ is twenty, $3$ is thirty, etc. If the number is outside $2-9,$ return "error". Finally, write a method twoDigitNumToWords$()$ that takes a two$-$digit number from $20-99$ and returns that number in words. Your main program should get a user's integer, call twoDigitNumToWords$(),$ and output the resulting string. If the input is $23,$ the output should be "twenty three".

Do not do any error checking of the input. Note that your program does not support all numbers. $0-19$ will yield error output, for example.

HINTS:

Write digitToWord$()$ first, and test the method $($have your main call that method directly$)--$ you won't pass any of the tests, but you should still start that way. Next, write tensDigitToWord$()$ and test it by itself also. Finally, write twoDigitNumToWords$()($calling your first two methods$)$ and test the entire program.

Your twoDigitNumToWords$()$ method should pass the ten's digit to tensDigitToWord$().$ To get the tens digit, divide the number by $10.$

Your twoDigitNumToWords$()$ method should pass the one's digit to digitToWord$().$ To get the ones digit, mod the number by $10($num $\%10).$

You can concatenate the strings returned by those two methods using the $+$ operator. Ex: "hello" $+""+$ "there" yields one string "hello there".