Full precision output of floating point types in SQL Server Management Studio

No.

SQL Server Management Studio rounds floating point values for display purposes; there is a Connect suggestion to change this behavior, but it is closed "as By Design". (Microsoft Connect, a public issue tracker for Microsoft software has been retired)

However, SQLCMD, osql and the Query Analyzer do not.

SQLCMD -E -S server -Q"SELECT CONVERT(FLOAT, 1555.4899999999998)"