Positive Testing Vs Negative Testing

Positive testing is that testing which attempts to show that a given module of an application does what it is supposed to do.
Negative testing is that testing which attempts to show that the module does not do anything that it is not supposed to do.
E.g of Positive testing If you are testing for boundary conditions for data ranging from 1-100 then at 101 it should throw and error.
If you are testing for boundary conditions for data ranging from 1-100 then at 101 it is not throwing an error.