Question

I started to learn cpp and encountered cin as a way to receive input from the keyboard.
If I understood, cin is an object and >> is an operator defined for it.
In the way it is defined, how does it “knows” to separate words from each other?
and another thing,
what is the meaning of:
while(cin)
is cin a bool type? what does it mean if it returns true or false?

Answer 1

Calling:

cin >> var1 >> var2 >> var3;

is equivalent to:

cin >> var1;
cin >> var2;
cin >> var3;

As far as your other question goes, in C/C++ anything that returns a NULL or zero is treated as false in an if statement, otherwise it is treated as true.

That’s why the line: if(cin) works to check whether there’s more data to be read in the stream.