Lesson 3

Input and Output

Most useful programs need to accept input from the user and display output clearly. In C++, this is commonly done with cin and cout.

Example

#include <iostream>
using namespace std;

int main()
{
    string name;
    int age;

    cout << "Enter your name: ";
    cin >> name;

    cout << "Enter your age: ";
    cin >> age;

    cout << "Hello, " << name << ". You are " << age << " years old." << endl;
    return 0;
}

Try it yourself:

Note: cin >> reads one word at a time. For full names with spaces, you will later use getline().

Book Tip:

This short lesson is part of a larger learning path. The full book expands each topic with more explanation, exercises, and projects.

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