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Turn off all of eclipse's ignore options and compile it again to get the messages.

Or compile with the javac command with the -Xlint option as shown above.

Your code has problems that the compiler will warn you about if you
use the javac -Xlint option. For example:
D:\Java\jdk1.7.0_45\bin\javac.exe -cp . -Xlint Thermostat.java

You need to have ...

What is on line 40?

That message is often given when the compiler is lost because of something wrong on the lines immediately before the line with the error. Take a close look at the lines of code just before the...

That's strange. The error message says: Unresolved compilation problem:
I'd interpret that as saying there is a syntax error in the code that gives an error when it is compiled.
Try compiling the...

For A) eclipse should show what the problem is when the cursor is moved over the line with the error.

B) Adjust must mean to change its value up or down.
Have you tried calling the...

Please explain.