Message and Print

Input is 1/0

ComplexInfinity

Input is Sin[x,1]

Sin[x, 1]

Input is Print["The result is ", x^2];5.6

5.6

The messages were:

                                 1
Power::infy: Infinite expression - encountered.
                                 0
Sin::argx: Sin called with 2 arguments; 1 argument is expected.

The print output was:

               2
The result is x

These are some evaluations that will cause messages to be generated by Mathematica. There is also a Mathematica print statement.