@echo off
set "number_to_round=55.5556"
echo %number_to_round%
for /f "tokens=1,2 delims=." %%a in ("%number_to_round%") do (
set first_part=%%a
set second_part=%%b
)
if defined second_part (
set /a rounded=%first_part%+1
) else (
set /a rounded=%first_part%
)
echo %rounded%