# Exercise 1 - FizzBuzz

## Exercise 1.1

You are going to write a function “Say” with input of integer and output of string. The function return the integer itself except these numbers:

- Multiples of three, returns “Fizz”
- Multiples of five, returns “Buzz”
- Multiples of three AND five, returns “FizzBuzz”

Here are sample outputs from the input 1 to 15:

```
1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
...
```

Please try implement this function in TDD way. Do not look for the solution on the internet before you try on your own. Different developers might come up with different codes.

Once done, check: Does your test code has good readability? Do you need to move around your code or your mouse in order to read your code?

## Exercise 1.2

What if we want to add more logics:

- Multiples of seven, returns “Wow”
- Multiples of three AND seven, returns “FizzWow”
- Multiples of five AND seven, returns “BuzzWow”
- Multiples of three, five AND seven, returns “FizzBuzzWow”

Here are some sample inputs/outputs:

7 = Wow

14 = Wow

21 = FizzWow

35 = BuzzWow

105 = FizzBuzzWow

Does your code has good maintainability? Can you add these logics without touching existing codes?

Exercise 1.3

What if we want to change some wordings:

- Multiples of three AND five, returns “Transfer”
- Multiples of three AND seven, returns “Thousand”
- Multiples of five AND seven, returns “Foresee”
- Multiples of three, five AND seven, returns “TFS”

Does your code has good maintainability? Can you change these words without touching existing codes?

## Solution

Please check out a solution on GitHub repository per below links. See how to trace code changes step-by-step from this blog.

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