Variables

You can think of a variable as a little box that stores a value in your program. C++ is a statically typed language, so you have to declare a variable's data type before you use it. For example, int age tells the compiler upfront that age will only ever store an integer value.

#include <iostream>
#include <string>
using namespace std;

int main() {
    int age = 20;
    double height = 5.8;
    char grade = 'A';
    string name = "Thuta";
    bool isLearning = true;

    cout << name << " is " << age << " years old." << endl;
    cout << "Height: " << height << endl;
    cout << "Grade: " << grade << endl;
    cout << "Learning C++: " << isLearning;
    return 0;
}

This example stores five variables with different data types. Since it uses string, it includes #include <string>. In cout, << lets you chain together text and variable values in the output.

Thuta is 20 years old. Height: 5.8 Grade: A Learning C++: 1