Hello world

Here is a simple example of a C++ program in a file named helloworld.cpp.

// helloworld.cpp

#include <iostream>

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

Use the terminal command shown below to build and run the program. You should see the words Hello world! printed in the terminal.

clang++ helloworld.cpp -o helloworld; ./helloworld

Gavin Wiggins © 2022