First post in this forum, pleased to be here.

I have been writing a simple program calculating a complete set of univariate statistics (more than Minitab, SPSS, etc.) In the process, I have come across a puzzling inaccuracy in reporting a rounded number.

I use the following function to round a number xx to dd decimal digits (solely for printing purposes):


Although the function works well, it has given me a solitary strange result: trying to round the number


to 4 decimal digits, it gives


instead of the expected


When the same function is used to round the number to fewer or more decimal digits, it works fine, without any weird trailing digits.

As an alternative, I tried using


which rounds and prints the number fine.

Help would be appreciated.