LengthUnitCalculator | Topcoder Archive

Problem Statement

Your task is to write a calculator that will convert between four different length units: inches (in), feet (ft), yards (yd), and miles (mi).

The conversions between these units:

1 ft = 12 in
1 yd = 3 ft
1 mi = 1760 yd

You are given an int amount and Strings fromUnit and toUnit. Compute and return the amount of toUnits that corresponds to amount fromUnits. (For example, if amount=41, fromUnit="mi", and toUnit="in", you are supposed to compute the number of inches in 41 miles.)
Note that the result will not necessarily be an integer.

Definition

Class:: LengthUnitCalculator
Method:: calc
Parameters:: int, String, String
Returns:: double
Method signature:: double calc(int amount, String fromUnit, String toUnit)
(be sure your method is public)

Notes

Pay attention to the unusual time limit.

Constraints

amount will be between 1 and 1,000, inclusive.
fromUnit will be one of {"in", "ft", "yd", "mi"}.
toUnit will be one of {"in", "ft", "yd", "mi"}.

Examples

```
1
```
```
"mi"
```
```
"ft"
```
```
Returns: 5280.0
```
We are asked to convert 1 mile into feet. From the information in the statement we know that 1 mi = 1760 yd = (1760 * 3) ft = 5280 ft.
```
1
```
```
"ft"
```
```
"mi"
```
```
Returns: 1.893939393939394E-4
```
Here we have 1 ft = 1/5280 mi, which is approximately 0.000189394 miles.
```
123
```
```
"ft"
```
```
"yd"
```
```
Returns: 41.0
```
```
1000
```
```
"mi"
```
```
"in"
```
```
Returns: 6.336E7
```
```
1
```
```
"in"
```
```
"mi"
```
```
Returns: 1.5782828282828283E-5
```
```
47
```
```
"mi"
```
```
"mi"
```
```
Returns: 47.0
```

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