Given an integer positive number with three digits, write a Python function named product$\_$of$\_$digits to return the product of all the digits. For example for the given number $123$ the return value must be$,1*2*3=6.$ You must obtain this numerically; you are not allowed to use Python string operations and any module or external libraries. In your main program, calculate and print the product of digits of $234.$

In your main program, calculate and print the product of digits of $757.$