Modify the Java program described in Practice Program so that it adds three numbers instea...

Modify the Java program described in Practice Program so that it adds three numbers instead of two. Compile the program so that you receive no compiler error messages. Then run the program.

Practice programs

Obtain a copy of the Java program shown in Listing from the Web at the location given in the preface. Name the file FirstProgram.java. Compile the program so that you receive no compiler error messages. Then run the program.