CS1011
Class Exercises
## Exercise 1: Math Using documentation for the [java.lang.Math](http://docs.oracle.com/javase/10/docs/api/java/lang/Math.html) class: 1. determine how to obtain the larger of two numbers, `a` and `b`. 2. write the code for when the numbers are `double`s 3. write the code for when the numbers are `long`s 4. what will be returned if `a` is a `long` and `b` is an `int`? 5. what will be returned if `a` is a `double` and `b` is an `int`? ## Exercise 2: Primitive to String Conversion Using documentation for the [java.lang.Double](http://docs.oracle.com/javase/10/docs/api/java/lang/Double.html) class: 1. Explain why the class is referred to as a **wrapper** class 2. Determine which of the following is the correct way to convert a `double` to a `String` and explain why ``` double pi = Math.PI; String number = Double.toString(pi); ``` or ``` Double pi = new Double(Math.PI); String number = pi.toString(); ``` 3. Determine any differences required for converting an `int` to a `String` ## Exercise 3: Characters Using documentation for the [java.lang.Character](http://docs.oracle.com/javase/10/docs/api/java/lang/Character.html) class: 1. Identify methods that would be useful for: * Determining if a character is a digit * Determining if a character is a letter * Determining if a character is a vowel * Determining if a character is capitalized 2. What characters are considered whitespace? ## Exercise 4: Strings Using documentation for the [java.lang.String](http://docs.oracle.com/javase/10/docs/api/java/lang/String.html) class: 1. Write a program that asks the user to enter a phrase and then displays: * The number of whitespace characters * The number of letters * If any digits were present 2. Write a program that asks the user to enter a phrase and then prints the phrase with each word displayed on a separate line. 3. Write code that takes a string, `phrase`, and ensures that there are no capital letters in it (if there are, they should be converted to lowercase characters). 4. Write code that will determine if a string, `phrase`, contains "**sap**" in it.

Monday, 01-Oct-2018 05:51:08 EDT