Answer Posted / Sudhir Kumar Tiwari
Undeclared variables are variables that have not been declared with the var, let, or const keyword. They will automatically create a global variable if they are used outside of a function, but will cause a ReferenceError within a function. On the other hand, undefined variables are declared but have not been assigned any value. They will return undefined when accessed and do not throw an error.
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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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