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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.

#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.                  

■图表 2-21. Complex Number Example

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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