Get number of digits before decimal point

Question

I have a variable of decimal type and I want to check the number of digits before decimal point in it. What should I do? For example, 467.45 should

Answer 1

If you treat zeros or lack of zeroes as 1 number, this is OK. If you want zero to return zero or lack of zero to return zero, then there are a few edge cases to work out which shouldn't be too hard to add. Also, should Absolute value to handle negative numbers. Added that test case as well.

        const decimal d = 123.45m; 
        const decimal d1 = 0.123m;
        const decimal d2 = .567m;
        const decimal d3 = .333m;
        const decimal d4 = -123.45m;

        NumberFormatInfo currentProvider = NumberFormatInfo.InvariantInfo;
        var newProvider = (NumberFormatInfo) currentProvider.Clone();
        newProvider.NumberDecimalDigits = 0;
        string number = d.ToString("N", newProvider);  //returns 123 =  .Length = 3
        string number1 = d1.ToString("N", newProvider); //returns 0 = .Length = 1
        string number2 = d2.ToString("N", newProvider); //returns 1 =  .Length = 1
        string number3 = d3.ToString("N", newProvider); //returns 0 =  .Length = 1
        string number4 = Math.Abs(d4).ToString("N", newProvider); //returns 123 =  .Length = 3

Here's a somewhat final solution, if you find a test case that doesn't work, let me know. It should return 3,0,0,0,3 for the test cases provided.

        public static int NumbersInFrontOfDecimal(decimal input)
        {
            NumberFormatInfo currentProvider = NumberFormatInfo.InvariantInfo;
            var newProvider = (NumberFormatInfo)currentProvider.Clone();
            newProvider.NumberDecimalDigits = 0;

            var absInput = Math.Abs(input);
            var numbers =  absInput.ToString("N", newProvider);

            //Handle Zero and < 1
            if (numbers.Length == 1 && input < 1.0m)
            {
                return 0;
            }

            return numbers.Length;
        }