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#include <iostream>

#include <string>

using namespace std;

void greet(const string& person) {

cout << "Hello, " << person << "!" << endl;

}

int main(int argc, char** argv) {

if(argc >= 2) {

greet(argv[1]);

} else {

cerr << "insufficient args, usage: " << argv[0] << " personNameHere" << endl;

}

return 0;

}