Contents > CFML Reference > ColdFusion Functions > Exp

Exp

Calculates the exponent whose base is e that represents number. The constant e equals 2.71828182845904, the base of the natural logarithm. This function is the inverse of Log, the natural logarithm of number.

The constant e, raised to the power of number.

Mathematical functions

Exp(number)

Log, Log10

To calculate powers of other bases, use the exponentiation operator (^).

<h3>Exp Example</h3>
<cfif IsDefined("FORM.Submit")>
   <cfoutput>
   <p>Your number, #FORM.number#
   <br>#FORM.number# raised to the E power: #exp(FORM.number)#
   <cfif FORM.number LTE 0>
      <br>You must enter a positive real number to see its natural logarithm 
      <cfelse><br>
      The natural logarithm of #FORM.number#: #log(FORM.number)#
   </cfif>
   <cfif FORM.number LTE 0><br>
      You must enter a positive real number to see its logarithm to base 10
      <cfelse><br>
         The logarithm of #FORM.number# to base 10: #log10(FORM.number)#
</cfif>
</cfoutput>
</cfif>
<cfform action = "exp.cfm">
Enter a number to see its value raised to the E power, its natural logarithm, 
and the logarithm of number to base 10.
<cfinput type = "Text" name = "number" message = "You must enter a number" 
validate = "float" required = "No">
<input type = "Submit" name = "Submit">
</cfform>

Contents > CFML Reference > ColdFusion Functions > Exp

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