What Is Happening Here?

[InclinedToFall]

So I am having a bit of confusion with understanding WHY this program works.

#include "std_lib_facilities.h"

int main()
{
	string previous =" ";	// previous word is "not a word"
	string current;			// current word
	while (cin>>current){	// read a stream of words
		if (previous==current)	// check if the current word is same as the last
			cout<<"repeated word: "<<current<<'\n';
		previous = current;
	}
}

Questions:
(1) Looking at line 7, how does (cin>>current) work? For example, I may say make my input "The cat cat jumped." but I don't understand how the word "cat" is isolated by the program.

(2) Does the (cin>>current) take my sentence one grouped character at a time? For example, is it interpreted as "The", "cat", "cat", "jumped", "."?

(3) What is the point of the last part (previous = current)? I don't understand how the previous variable is working.

Thanks for the help!

-Inclined

[InclinedToFall]

I should mention this is a simple repeat-word-detecting program.

[vlad from moscow]

@InclinedToFall
(3) What is the point of the last part (previous = current)? I don't understand how the previous variable is working.

Ask yourself how would you do to compare every current word with its previous word.

[Ispil]

Well, what is happening here is that it first sets the previous word to a space, and leaves the current word blank. Then what happens is that when you input into the string current (which is what the while loop does- as long as there is input, it will keep going) which can only hold a single word due to using cin, it checks it against what is held in previous. After that, it stores the newly-added word into previous so that the next word would be checked against that.

More specifically to your questions:

1) cin only takes input up until a space. So yes, it does break it into individual words.
2) Yes, for cin only takes one-word inputs.
3) Previous is the word immediately before the word it is checking. If it is equal to the new word inputted, then there is a repeat.

[InclinedToFall]

Thank you both, vlad and Ispil. I appreciate your input.

Ispil, thank you secifically for your detailed response. It is much clearer now.

-Incline