Complete the following program to implement the user interface of the preceding exercise (above). For simplicity, only the units cm, m, and in are supported. Pleas stay in this format only.

#include  #include  using namespace std; int main() { bool done = false; string unit1 = ""; string unit2 = ""; double factor1 = 0; // conversion factor from first unit to cm double factor2 = 0; // conversion factor from cm to second unit while (!done) { bool again = false; // true to repeat the same conversion cout > command; if (command == "in") { factor1 = 2.54; unit1 = command; } else if (command == "cm") { . . . } else if (command == "m") { . . . } else if (command == "again") { again = true; } else if (command == "quit") { done = true; } else { cout > unit2; if (unit2 == "in") { factor2 = 1.0 / 2.54; } else if (unit2 == "m") { . . . } else if (. . .) { } else { cout > value; // Convert and print result cout