Question

Python 3

Write a function oneSum which takes one input, n, and finds the sum: For example: >>> print (oneSum( 1)) which is 1-1. >>> print (oneSum( 2)) 12 Which is 111 12. print (oneSum(3 ) 123 Hint: think about each element of the sum (1, 11, 111, for example) represented as a sum of powers of 10: 111-100 + 10^1 + 10^2= 1 + 10 + 100 For example: Test Result print(oneSum(3))123 print (oneSum(4)) 1234 print(oneSum(e)) print(oneSum(1) 1 1

Answer 1

Here is the code for you:

#!/usr/bin/python
def oneSum(count):
   '''
       Takes one input count, and finds the sum
       1 + 11 + 111 + 1111 + ... + up to n digits of 1.
   '''
   value = 0;
   for i in range(count):
       value = value * 10 + 1;
   if(count == 0):
       return 0
   return value + oneSum(count-1)      

print oneSum(1)  
print oneSum(2)
print oneSum(3)
print oneSum(4)
print oneSum(0)

And the output screenshot is: