class AClass
{
public:
int GetSomething(){return var;}
private:
int var;
};
// This returns true if first num is greater than the other
bool Func(AClass Cclass, AClass CotherClass)
{
return Cclass.GetSomething() > CotherClass.GetSomething();
} extra return stuff...
Author
I dont really know where this belongs so I''ll put it in here...
Now obviouly this is not a whole program but I saw something similer to is and was just wondering if this works(I presume it does) and if so why and how? I mean the member functions would be returning values and so I dont get it...
CEO Plunder Studios
What''s not to get? (CClass.GetSomething() > CotherClass.GetSomething()) evaluates to a boolean, and that''s what func returns...
codeka.com - Just click it.
codeka.com - Just click it.
Yes, those methods return integers. And those numbers are then compared. The result of the compare is a boolean.
e.g:
e.g:
bool Func(X, Y){ return X.GetSomething() > Y.GetSomething(); // imagine X.GetSomething() is 1 // and Y.GetSomething() is 2 // then 1 > 2 false // i.e the mothod returns false in this case}
Author
but I thought there would have had to been an if() expression for it to come out as true or false...
So I can use < > && || == <= => anywhere in my code and it will evaluate the statments on either side to a true or false?
CEO Plunder Studios
So I can use < > && || == <= => anywhere in my code and it will evaluate the statments on either side to a true or false?
CEO Plunder Studios
yes, you can use the return values from functions immediately like that
it''s the same as saying
if (Cclass.GetSomething() > CotherClass.GetSomething()
return true;
else
return false;
it saves typing and looks neater. in c/c++ anything that evaluates to 0 is false and anything non-zero is considered true...
that is why stuff like
while (1)
{
}
will be an infinate loop and :
while(0)
{
}
will not execute.
hope that helps
-Pac
it''s the same as saying
if (Cclass.GetSomething() > CotherClass.GetSomething()
return true;
else
return false;
it saves typing and looks neater. in c/c++ anything that evaluates to 0 is false and anything non-zero is considered true...
that is why stuff like
while (1)
{
}
will be an infinate loop and :
while(0)
{
}
will not execute.
hope that helps
-Pac
quote:Original post by elis-cool
but I thought there would have had to been an if() expression for it to come out as true or false...
A selection statement takes an expression as its argument. That expression must evaluate to a bool type or something that is convertible to a bool type. if merely branches based on the resultant bool.
quote:
So I can use < > && || == <= => anywhere in my code and it will evaluate the statments on either side to a true or false?
It will evaluate the entire expression and return the result of that expression. If it is a conditional expression, the result will be of bool type.
[C++ FAQ Lite | ACCU | Boost | Learning C++]
[edited by - SabreMan on April 17, 2002 8:52:55 AM]
This topic is closed to new replies.
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