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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

# EXP

Returns e (the base of natural logarithms) raised to a power.

## Synopsis

```EXP(number)
```

### Arguments

 number An expression that resolves to a number within the following range: On a Windows system, if the value of number is greater than 335.601, a error occurs; if the value of number is less than -295.424, EXP returns zero (0).

## Description

The EXP function takes the natural log constant e and raises it to the power specified by the number argument. The constant e (EXP(1)) is approximately 2.718282. If number is 0, the null string (""), or a non-numeric value, EXP parses number as 0 and returns 1.

The EXP function complements the action of the LN function and is sometimes referred to as the antilogarithm.

In ObjectScript, the corresponding function is \$ZEXP.

## Examples

The following example uses the EXP function to calculate e raised to the power of each of the integers -10 through 10:

```FOR x = -10 TO 10
PRINT "Natural log to the power of ",x," = ",EXP(x)
NEXT```

The following example uses the EXP function to return the hyperbolic sine of an angle:

```MyAngle = 1.3
! Define angle in radians.
MyHSin = (EXP(MyAngle) - EXP(-1 * MyAngle)) / 2
! Calculate hyperbolic sine.
PRINT MyHSin```