I added the command line arguments "-3.0" and "2.0" and I received the output "2.0", "1.0", and "e". I have no idea what "e" is or why I got it.
Here's a link to a page which describes some Unicode characters, including the Latin character set: List of Unicode characters. Note that the code points are expressed in hexadecimal.
I'm not sure why you're doing that, though, since it doesn't have anything to do with solving quadratic equations.
Step 1. Write Program 1.2.3 Quadratic formula. Copy the program from the textbook. DO NOT download the program from the web, or copy the program from some other source. Type it in yourself.
^^^^This was where the code for the quadratic formula that I posted came from.
Step 2. Now extend the above program and add the following print statements and explain the outcome of each print statement.
a. System.out.println(2 + "bc");
b. System.out.println(2 + 3 + "bc");
c. System.out.println('b' + 'c');
d. System.out.println((char) ('a' + 4));