Could you tell me why a=a + b - (b=a) to exchange a, b value, of which the rules of grammar is how

CodePudding user response:

Oh I see be okay

CodePudding user response:

A=a + b - a \ \ b=(a) the value of a, the first operation in brackets

B=a

But it really general, don't feel,

CodePudding user response:

This usage is the premise, is a + b should not exceed the scope of this type, or beyond the scope of cross-border turned negative, may not want to be the result of the