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function Exp (x: Real): Real; |
function Exp (z: Complex): Complex; |
The exponential function `Exp' computes the value of e to the power of x, where the Euler number e = Exp (1) is the base of the natural logarithm.
The function `Exp' is defined in ISO-7185 Pascal; its application to complex values is defined in ISO-10206 Extended Pascal.
program ExpDemo; var z: Complex; begin z := Cmplx (1, - 2 * Pi); { z = 1 - 2 pi i } z := Exp (z); { yields e = Exp (1), since Exp ix = Cos x + i Sin x } WriteLn (Ln (Re (z)) : 0 : 5) { prints 1 = Ln (Exp (1)) } end. |
section 9.135 Ln