Python question - Basic.

[X1XNobleX1X]

Hello forums,

I need a little help with Grok. 

I'm really not sure what I'm suppose to do for this question. 

I know we're suppose to use "while" and times the input by 2 until it reaches 7,000,000,000. How how do I do this?

This is what I have at the moment:

 

alpha = int(input("Number of initial customers:"))

years = (alpha * 2)

while years == 7000000000:

  

  

 

This is what the program is suppose to do:

For a given number of initial customers, write a program to calculate how many years it will take to have everyone on the planet as a customer, assuming they continue to double each year. As an estimate, let's say the current human population is 7,000,000,000.

Your program should work like this:

 

 

 

 

Number of initial customers: 2

Number of years: 32​

 

Here is another example:

 

 

 

 

Number of initial customers: 42

Number of years: 28​

Your answer should be in whole years. For instance, if the answer is 1 year, then the number of customers after doubling once is greater than 7,000,000,000.

[Student]

alpha = int(input("Number of initial customers:")) 

years = 0

while alpha <= 7000000000:

  years = years + 1

  alpha = (alpha*2)

print 'Number of years:', years

[X1XNobleX1X]

 

alpha = int(input("Number of initial customers:")) 

years = 0

while alpha <= 7000000000:

  years = years + 1

  alpha = (alpha*2)

print 'Number of years:', years

 

Thank you so much.

The only problem, is it says when inputing 13671875

do this. 

Testing a case where the customers double to exactly 7000000000. Your submission did not produce the correct output. Your program output:

 

 

 

 

Number of initial customers:13671875

Number of years: 10​

 

when it was meant to output:

 

 

 

 

Number of initial customers: 13671875

Number of years: 9​

[MrSuperb]

 

Thank you so much.

The only problem, is it says when inputing 13671875

do this. 

Testing a case where the customers double to exactly 7000000000. Your submission did not produce the correct output. Your program output:

 

 

 

 

 

Number of initial customers:13671875

Number of years: 10​

 

when it was meant to output:

 

 

 

 

 

Number of initial customers: 13671875

Number of years: 9​

 

 

well "<=" means "equal or less than"

guess what "<" means.

 

 

 

alpha = int(input("Number of initial customers:")) 

years = 0

while alpha <= 7000000000:

  years = years + 1

  alpha = (alpha*2)

print 'Number of years:', years

 

 

don't give full solutions to problems. this won' help the OP after all ...

[Doldol]

Also, neat little "trick":

years += 1

alpha *= 2