string first_name { "Time" }; string second_name { "Machine" }; char first_n[100] = { "Hello" }; char second_n[100] = { "World" }; // METHOD 1: uses header cout << first_name + second_name << endl; // METHOD 2: uses header cout << strcat(first_n, second_n) << endl; // METHOD 3: uses header cout << first_name.append(second_name) << endl;