Write a main method that prompts the user to enter the
starting population, birth and death rates,
and the number of years. The input birth and death rates
cannot be negative, the starting population
cannot be less than 2, and the number of years greater than
0. If the user enters an invalid value, this
program will prompt user to re-enter the value until a
valid value has been read. When all input
values are valid, call on the methods above to compute
estimated population and print result.


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