Python Unit 5lab 2

Question

A local biologist needs a program to predict population growth. The

inputs would be:

the initial number of organisms,

the rate of growth (a real number greater than 0),

the number of hours it takes to achieve this rate,

and a number of hours during which the population grows.

 

For example, one might start with a population of 500 organisms, a growth

rate of 2, and a growth period to achieve this rate of 6 hours. Assuming

that none of the organisms die, this would imply that this population

would double in size every 6 hours. Thus, after allowing 6 hours for

growth, we would have 1000 organisms, and after 12 hours, we would

have 2000 organisms. Write a program that takes these inputs and displays

a prediction of the total population.

Eg. Output in this format:

#organisms        growth_rate     hours achieve rate          total_hours       #organisms

500                        2x                          6.00              6.00               1,000

1,000                      2x                          6.00             12.00              2,000

2,000                      2x                          6.00             18 .00             4,000   

Answer 1

P0 = -1

while (float(P0)<=0):

P0 = input(" How many initial population ??? :>")

R=-1

while float(R)<0:

R = input(" Please input the growth rate :>")

t = -1

while float(t)<0:

t = input("please input the time :>")

N = -1

while int(N)<0:

N = input(" how many interations ??? :>")

print(" initial population = " + str(P0) + " : growth rate = " + str(R) + " : time = " + str(t) + " : " + str(N) + " iterations ")

P = P0

print("Time Population")

for i in range(int(N)):

timeT = int(i)*float(t)

print(" " + str(timeT) + " " + str(P))

P = float(R)*float(P)