why does the string not equal to the inputted string value?

Question

basic overview of my code:

cin>>userinput // i input "hi there"

cout<<userinput //outputs hi, not hi there?

Answer 1

because cin reads the string until it reads a space
use getline(cin, userinput) to read the whole line

Answer 2

cin ends at whitespace you will need to use getline instead.

Answer 3

getline(cin,strUserInput);
cout << strUserInput;