h.i

来自「强大的数学工具包」· I 代码 · 共 9 行

                               * * * * * * *
                               *   i, I    *
                               * * * * * * *

        i or I are the representations of sqrt(-1).
        Complex numbers are entered in the form
              x + y * i     or    x + y * I
        and are displayed by  x + y * i.