Question

Starting out with Python 4th edition

I need help with while loops I can't even get one started correctly.

Write a program a program that predicts the approximate size of a population of organisms.

Problem 4.13 – population

Use a while loop; there are no text boxes, just regular input statements

Enter number of organisms: 2

Enter average daily increase: 30

Enter number of days to multiply: 10

DAY       APPROXIMATE POPULATION

-------------------------------------------------

1            2

2            2.600

3            3.380

4            4.394

5            5.712

6            7.426

7            9.654

8            12.550

9            16.315

10         21.209

starting_number = int(input('Enter the starting number of organisms: '))
daily_increase = int(input('Enter the average daily population increase (as a percentage): '))
days = int(input('Enter the number of days to multiply: '))

print('Day', '\t', 'Approximate Population')
print('------------------------------------')

Answer 1

Here is the answer..

CODE:

starting_number = int(input('Enter the starting number of organisms: '))
daily_increase = int(input('Enter the average daily population increase (as a percentage): '))
days = int(input('Enter the number of days to multiply: '))

print('Day', '\t', 'Approximate Population')
print('------------------------------------')
i=1
print('{0} \t {1}'.format(i,starting_number))#for printing first line it doesn't have trailing zeros 2.000
i+=1#increment i
while(i<days+1):#iterate through the days
starting_number+=starting_number*daily_increase/100#calculate daily increment
print('{0} \t {1:.3f}'.format(i,starting_number))#print result
i+=1
  
CODE Snapshot:

OUTPUT:

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