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| ANSI Common Lisp 2 Syntax 2.4 Standard Macro Characters 2.4.8 Sharpsign ### 2.4.8.11 Sharpsign C `#C` reads a following object, which must be a list of length two whose elements are both reals. These reals denote, respectively, the real and imaginary parts of a complex number. If the two parts as notated are not of the same data type, then they are converted according to the rules of floating-point contagion described in Section 12.1.1.2 Contagion in Numeric Operations. `#C(real imag)` is equivalent to `#.(complex (quote real) (quote imag))`, except that `#C` is not affected by *read-eval*. See the function complex. The next figure contains examples of the use of `#C`.
Complex Number Example
`#C(3.0s1 2.0s-1)` | ;A complex with small float parts.
`#C(5 -3)` | ;A "Gaussian integer"
`#C(5/3 7.0)` | ;Will be converted internally to `#C(1.66666 7.0)`
`#C(0 1)` | ;The imaginary unit; that is, i.
For further information, see Section 22.1.3.1.4 Printing Complexes and Section 2.3.2.3 Syntax of a Complex.

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