Function in c$++$ language

Weight on Another Planet: The weight of any object on a planet depends on both the radius

and the mass of the planet itself, but the formula becomes very easy if you start with the

object$$s weight on Earth. For example,

$$ for Venus, multiply the weight on Earth with $0\mathrm{.}905$

$$ for Mars, multiply with $0\mathrm{.}3787$

$$ for Jupiter, multiply with $2\mathrm{.}53$

Write a function named calculateWeight that accepts the name of the planet and an object$$s

weight on Earth as arguments, and returns the weight on that planet. Demonstrate the

function by calling it in a program that asks the user to enter values for the planet and the

weight.

Population: In a population, the birth rate is the percentage increase of the population due to

births, and the death rate is the percentage decrease of the population due to deaths. Write a

program that displays the size of a population for any number of years. The program should

ask for the following data:

$$ The starting size of a population

$$ The annual birth rate

$$ The annual death rate

$$ The number of years to display

Write a function that calculates the size of the population for a year. The formula is

N $=$ P $+$ BP $$ DP

where N is the new population size, P is the previous population size, B is the birth rate, and

D is the death rate.

Input Validation: Do not accept numbers less than $2$ for the starting size. Do not accept

negative numbers for birth rate or death rate. Do not accept numbers less than $1$ for the

number of years.