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#include <iostream> #include <stdexcept> #include <string> using namespace std; int main() { string username = "programmer_john_1990"; try { if (username.length() > 12) { throw length_error("The username can have at most 12 characters"); } cout << "Welcome, " << username; } catch (const length_error& e) { cout << e.what(); } return 0; }
The username can have at most 12 characters
