Lab: String Operations

Goals for this lab:

1. Explore some of the properties of the pre-defined String class.
2. Write conditional statements.
3. Think about problem solving.

This lab depends on the introductory material earlier in this chapter, particularly s.length.

Design, compile and run a single Scala object (with functions) to accomplish all of the following tasks. Add one part at a time and test using sbt test before trying the next one.

1. Read a string from the keyboard and print the length of the string, with a label.

2. Read a sentence (string) from a line of input, and print whether it represents a declarative sentence (i.e. ending in a period), interrogatory sentence (ending in a question mark), or an exclamation (ending in exclamation point) or is not a sentence (anything else).

   This may be the first time you write a conditional statement. (This needs the next chapter.) It makes sense to only make small changes at once and build up to final code. First you might just code it to check if a sentence is declarative or not. Then remember you can test further cases with else if (...).

3. Read a whole name from a line of input. Assume first and last names are separated by a space (no middle name). Print last name first followed by a comma and a space, followed by the first name. For example, if the input is "Marcel Proust", the output is "Proust, Marcel".

4. Improve the previous part, so it also allows a single name without spaces, like "Socrates", and prints the original without change. If there are two parts of the name, it should work as in the original version.

Run the program (with parts 1, 2 and 4 active) from a terminal window and show your TA when you are done. You should run it twice to show off both paths through part 4. Alternately have the main program just call part 4 twice!