Complex numbers start with are enclosed in parentheses ( ) and contain two real numbers, the real part and the imaginary part, separated by a comma (,). Examples: (0,1), (1.2, 3.4). Complex numbers are displayed using the current display mode: std, eng, fix, or sci. Complex numbers are displayed as length an angle in plr mode or as real part and imaginary part in rct mode. When in polar (plr) coordinate mode, the complex angle is displayed using the current angle mode: rad, deg, or grad. The period (.) and comma (,) may be swapped depending on Windows regional number settings.