I have been writing code for years ,one of the most difficult and annoyed questions is to write the if statement .
imaging now we are writing the codes to dispose the input of the users.
let's begin with the simplest situation .
if the judged condition is bool, such as :
we can simply change it to
now, consider the another situation
we can change it to
Now,let's talk about the last situation .
change it to
Well, the difference between the last situation and others , is that the else of others is opposite to the if , such as bool and !bool , but the condition of if of last situation is independent .
