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function Exp (x: Real): Real;or
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.