Type Conversion Exercises

Define a method, #two_digit_sum, that accepts a two-digit integer as an argument. Your method should return the sum of the two digits.
```
 two_digit_sum(34) == 7 # ==> 3 + 4 == 7
```
Define a method, #orders_of_magnitude, that accepts an integer as an argument. Your method should return the number of digits in the integer.
```
 orders_of_magnitude(99) == 2
 orders_of_magnitude(1034) == 4
```
Define a method, #accurate_division, that accepts two integers as arguments. Your method should return the quotient of the two integers (rounding to 3 decimal places).
```
 accurate_division(3, 4) == 0.75
 accurate_division(1, 3) == 0.333
 accurate_division(7, 6) == 1.167
```
Define a method, #two_digit_format, that accepts an integer, n, and returns a string version of that integer. If the integer has a single digit, you should append a 0. You can assume that n will always be two or fewer digits. Hint: try creating a string using '0' + n.to_s, then use #slice to get the last two digits!
```
 two_digit_format(8) == "08"
 two_digit_format(12) == "12"
```
Define a method, #time_string that accepts 3 arguments: hours, minutes, and seconds (all integers). Convert these integers into one contiguous time string that has the following format:
```
 "hh:mm:ss"
```
Use the method, #two_digit_format, to help you do this!
```
 time_string(12, 1, 3) == "12:01:03"
 time_string(1, 10, 6) == "01:10:06"
```

Exercises