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## 9.78 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

section 9.135 Ln

This document was generated by Frank Heckenbach on May, 10 2002 using texi2html