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### Exp

#### Synopsis

         function Exp (x: Real): Real;

or

         function Exp (z: Complex): Complex;

#### Description

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.

#### Conforming to

The function `Exp` is defined in ISO 7185 Pascal; its application to complex values is defined in ISO 10206 Extended Pascal.

#### Example

         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.

#### See also

Ln