I don't understand use of cin

Answer 1

• User Input

To enable the user to input a value, use 'cin' in combination with the extraction operator (>>). The variable containing the extracted data follows the operator.

https://www.sololearn.com/learn/CPlusPlus/1607/

As with 'cout', extractions on 'cin' can be chained to request more than one input in a single statement: cin >> a >> b;

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Answer 2

Used to input data from the command line/console into the program.