He's speaking in terms of boolean values, not the equation in whole.would say that a value minus itself results in a false boolean value. You want to see the right value as the result the condition on the left gives you. Not as part of the equation. For instance:
You see? I hope I understood your question correctly.
// when he writes ( 1 - 1 = 0 )
// you should view a conditional with the left value as the whole condition
if(1 - 1) // Returns a boolean false
// as opposed to the whole thing as the condition
if(1 - 1 == 0) // This as you said, is not false