Finding the last row or column

How to find the last row or last column in any excel sheet

LR = ActiveSheet.UsedRange.SpecialCells(xlLastCell).Row

LC = ActiveSheet.UsedRange.SpecialCells(xlLastCell).Column

or 

LR= range("A65536").end(xlup).row

Lc=range("IV1").end(xltoleft).column