Convert length from one unit to another - Java Quiz Question

Write a program to convert length from one unit to another. Use only Inches, Centimeters, Feet, Meters, Kilometers, Miles for conversion and round off the result to two decimals. Return -1 if conversion is not possible. 1 feet=30.48 cms, 1 mt=3.2808 foot, 1 mile=1.6093 km.

Input (double, String, String)	Output (double)
2.23, Kilometers, Centimeters	223000.0
21.65, Inches, Meters	0.55
68.5, Meters, Feet	224.74
56.22, Acre, Meters	-1.0
6.5, Foot, Centimeters	198.12
86.4, Meters, Miles	0.05


			

			class ConvertLengthToOtherUnit 
 { 

			    public static void main(String s[])
    {
        double length = 6.5;
        String inputUnit = "Foot", outputUnit = "Centimeters";
        System.out.println("Converting " + length + " " + inputUnit + " to " + outputUnit + " we get " + convertToOtherUnit(length, inputUnit, outputUnit));

    }
 
			

			

					    public static double convertToOtherUnit(double length, String input, String output) {

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