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C++

Variables & Data Types

Like Java, C++ variables need an explicit type: int age = 21;.

Example: string, int, and output together

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

int main() {
    string name = "Ada";
    int age = 21;
    cout << name << " is " << age << " years old." << endl;
    return 0;
}
Ada is 21 years old.

Common types: int, double, bool, and string (from the <string> header — notice it needs its own separate include, unlike iostream). Chaining multiple << together, as above, is the standard C++ way to build up a printed line from several separate pieces.

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

int main() {
    string name = "Ada";
    int age = 21;
    cout << name << " is " << age << " years old." << endl;
    return 0;
}
Output
Ada is 21 years old.
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