16.3 (Comparingstrings) Write an app that uses string method CompareTo to compare two strings input by the user. Output whether the first string is less than, equal to or greater than the second.

16.4 (Random Sentences and Story Writer) Write an app that uses random-number generation to create sentences. Use four arrays of strings, called article, noun, verb and preposition. Create a sentence by selecting a word at random from each array in the following order: article, noun, verb, preposition, article, noun. As each word is picked, concatenate it to the previous words in the sentence. The words should be separated by spaces. When the sentence is output, it should start with a capital letter and end with a period. The program should generate 10 sentences and output them to a text box.

The arrays should be filled as follows: The article array should contain the articles "the", "a", "one", "some" and "any"; the noun array should contain the nouns "boy", "girl", "dog", "town" and "car"; the verb array should contain the past-tense verbs "drove", "jumped", "ran", "walked" and "skipped"; and the preposition array should contain the prepositions "to", "from", "over", "under" and "on".

16.5 (Pig Latin) Write an app that encodes English-language phrases into pig Latin. Pig Latin is a form of coded language often used for amusement. Many variations exist in the methods used to form pig Latin phrases. For simplicity, use the following algorithm:

To translate each English word into a pig Latin word, place the first letter of the English word at the end of the word and add the letters “ay.” Thus, the word “jump” becomes “umpjay,” the word “the” becomes “hetay” and the word “computer” becomes “omputercay.” Blanks between words remain blanks. Assume the following: The English phrase consists of words separated by blanks, there are no punctuation marks and all words have two or more letters. Enable the user to input a sentence. Use techniques discussed in this chapter to divide the sentence into separate words. Method GetPigLatin should translate a single word into pig Latin. Keep a running display of all the converted sentences in a text box.

16.6 (All Possible Three-Letter Words from a Five-Letter Word) Write a program that reads a five-letter word from the user and produces all possible three-letter combinations that can be derived from the letters of the five-letter word. For example, the three-letter words produced from the word “bathe” include the commonly used words “ate,” “bat,” “bet,” “tab,” “hat,” “the” and “tea,” and the 3-letter combinations “bth,” “eab,” etc.

16.7 (Capitalizing Words) Write a program that uses regular expressions to convert the first letter of every word to uppercase. Have it do this for an arbitrary string input by the user.