Write a function that takes and returns an istream&. The function should read the stream until it hits end-of-file. The function should print what it reads to the standard output. Reset the stream so that it is valid before returning the stream.
istream& func(istream &is)
{
std::string buf;
while (is >> buf)
std::cout << buf << std::endl;
is.clear();
return is;
}What causes the following while to terminate?
while (cin >> i) /* ... */putting cin in an error state cause to terminate. such as eofbit, failbit and badbit.
Why didn’t we use in-class initializers in PersonInfo?
Cause we need a aggregate class here. so it should have no in-class initializers.
Why did we declare entry and nums as const auto &?
- cause they are all class type, not the built-in type. so reference more effective.
- output shouldn't change their values. so we added the
const.