Re: [Dev-C++] Problem with 'std::cout' (?)

[matheus r. <mfr...@gm...>]

Ok, my bad here. Disregard my previous mail.

The operator << evaluation happens from left to right. But probably,
the compiler evaluates all parameters in the line first from right to
left, then applies operator <<.

Perhaps other people can help here, interesting question.

2007/10/4, matheus ribeiro <mfr...@gm...>:
> The statement evaluation happens from right to the left, like all
> others. But the ostream operator << acts like a stack. You evaluate
> expression from right, push. Then at the end, everything added is
> popped.
>
> So basically, you push 512, 256, 128. Then you pop 128, 256, 512.
>
> 2007/10/4, Franco Brancaccio <fbr...@gm...>:
> > Dear Friends,
> >
> > I observed an irregular (I think) comportment of 'std::cout'
> > reproduced by the simple test code below:
> >
> >
> > #include <iostream>
> >  using namespace std;
> >
> >
> >  int myFunc();     // simple test function prototype
> >
> >
> >  // test program
> > int main()
> >  {
> >    cout  << myFunc() << endl           // this block results
> >           << myFunc() << endl           // in an inverted
> >           << myFunc() << endl << endl;  // console output
> >
> >     cout  << myFunc() << endl;          // this block results
> >    cout  << myFunc() << endl;          // in a correct
> >    cout  << myFunc() << endl << endl;  // console output
> >
> >    system("PAUSE");
> >     return 0;
> > }
> >
> >
> > // simple test function implementation
> >  int myFunc()
> > {
> >     static int i = 1024;
> >    i /= 2;
> >     return i;
> > }
> >
> >
> > The console output for this code is:
> >
> >
> > 128
> > 256
> >  512
> >
> > 64
> >  32
> > 16
> >
> >  Press any key to continue...
> >
> >
> >  The questions:
> > The two 'cout' blocks act in a different manner! (?)
> > Why the first chained block results in an inverted output?
> >  Does not the insert operator '<<' act from left to right?
> >
> >  Obs.: I'm using
> >       Dev-C++ 4.9.9.2 ,
> >       Win XP 5.1,
> >        g++ (1/29/2005).
> >
> >
> >  TIA,
> > Franco Brancaccio
> >  fbr...@gm...
> >
> >
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