◆四捨五入（銀行型丸め）
Round(3.5) =4
Round(2.5) =2
Round(1.5) =2
Round(0.5) =0
Round(0.0) =0
Round(-0.5) =0
Round(-1.5) =-2
Round(-2.5) =-2
Round(-3.5) =-4
◆四捨五入（銀行型丸め）戻り値は実数
RoundTo(3.5,0) =4
RoundTo(2.5,0) =2
RoundTo(3.35,-1) =3.4
RoundTo(3.25,-1) =3.2
RoundTo(1.245,-2) =1.24
RoundTo(6276,0) =6300