# Chapter 20 Worksheet

1. (1 pt) Take the following program:
score = 41237
highscore = 1023407

print("Score:      " + str(score) )
print("High score: " + str(highscore) )


Which right now outputs:

Score:      41237
High score: 1023407


Use print formatting so that the output instead looks like:

Score:          41,237
High score:  1,023,407


Make sure the print formatting works for any integer from zero to nine million. Do not use any plus sign (+) in your code. You should only have two double quotes in each print statement.

2. (3 pts) Create a program that loops from 1 to 20 and lists the decimal equivalent of their inverse. Use print formatting to exactly match the following output:
1/1  = 1.0
1/2  = 0.5
1/3  = 0.333
1/4  = 0.25
1/5  = 0.2
1/6  = 0.167
1/7  = 0.143
1/8  = 0.125
1/9  = 0.111
1/10 = 0.1
1/11 = 0.0909
1/12 = 0.0833
1/13 = 0.0769
1/14 = 0.0714
1/15 = 0.0667
1/16 = 0.0625
1/17 = 0.0588
1/18 = 0.0556
1/19 = 0.0526
1/20 = 0.05

3. (3 pts) Write a recursive function that will calculate the Fibonacci series, and use output formatting. Your result should look like:
 1 -          1
2 -          1
3 -          2
4 -          3
5 -          5
6 -          8
7 -         13
8 -         21
9 -         34
10 -         55
11 -         89
12 -        144
13 -        233
14 -        377
15 -        610
16 -        987
17 -      1,597
18 -      2,584
19 -      4,181
20 -      6,765
21 -     10,946
22 -     17,711
23 -     28,657
24 -     46,368
25 -     75,025
26 -    121,393
27 -    196,418
28 -    317,811
29 -    514,229
30 -    832,040
31 -  1,346,269
32 -  2,178,309
33 -  3,524,578
34 -  5,702,887
35 -  9,227,465

4. (1 pt) Why does the problem above run so slow? How could it be made to run faster? Ask if you aren't sure.
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