Your First C++ Program

Create a file named hello.cpp:

#include <iostream>

int main() {
    std::cout << "Hello, world!" << std::endl;
    return 0;
}

g++ -std=c++20 hello.cpp -o hello
./hello

std::cout ("character output") sends text to the console using <<, in place of C's printf; std:: is a namespace prefix, covered in its own lesson shortly.

Practice

Change the program to print your own name instead of "Hello, world!".

#include <iostream>

int main() {
    std::cout << "Ada" << std::endl;
    return 0;
}