private static int romanDigit(final char c) {
        //I=1, V=5, X=10, L=50, C=100, D=500, M=1000
        switch (c) {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
            default:
                return -1;
        }
    }
Holds implementations for functions in Formula
main/src/main/java/cgeo/geocaching/utils/formulas/FormulaUtils.java