$4.$ Write a $\backslash (\backslash$mathrm$\{$C$\}++\backslash )$ program that continuously finds the Greatest Common Devisor $($GCD$)$ and the Least Common Multiplier $($LCM$)$ of three positive integers. The main function should prompt the user to enter the three numbers and then call two functions to calculate the greatest common divisor and the least common multiplier, respectively. The program stops if any of the three numbers is zero or negative.