Please post a program written in C

Hello /prog/, how are you today?

Please post a program written in C, so that we all may compile it on our computers and share in the enjoyment of your program.

#include <iostream>
#include <string>
#include <vector>
int main(std::vector<std::string> argv) {
std::cout << "Hello, world" << std::endl;
return 0;
}