You have already learned that cout is used to output (print) values. Now we will use cin to get user input.
cin is a predefined variable that reads data from the keyboard with the extraction operator ( >> ).
In the following example, the user can input a number, which is stored in the variable x . Then we print the value of x :
Example
int x;
cout << "Type a number: "; // Type a number and
press enter
cin >> x; // Get user
input from the keyboard
cout << "Your number is: " << x;
// Display the input valuecout is pronounced "see-out". Used for output , and uses the insertion operator ( << )
cin is pronounced "see-in". Used for input , and uses the extraction operator ( >> )
Creating a Simple Calculator
In this example, the user must input two numbers. Then we print the sum by calculating (adding) the two numbers:
Example
int x, y;
int sum;
cout << "Type a number: ";
cin >> x;
cout << "Type another number: ";
cin >> y;
sum = x + y;
cout << "Sum is: " << sum;There you go! You just built a basic calculator!