The {{KW|UBOUND}} function returns the largest valid index (upper bound) of an array dimension.


{{PageSyntax}}
:''result%'' = {{KW|UBOUND}}(arrayName[, dimension%])


{{PageDescription}}
* {{Parameter|arrayName}} specifies the name of the array.

* {{Parameter|dimension%}} specifies the dimension number, starting with &lt;code&gt;1&lt;/code&gt; for the first dimension.
** If omitted, {{Parameter|dimension%}} is assumed to be &lt;code&gt;1&lt;/code&gt;.
** If {{Parameter|dimension%}} is less than &lt;code&gt;1&lt;/code&gt; or is greater than the number of dimensions, a [[ERROR Codes|subscript out of range]] error occurs.

* {{KW|UBOUND}}, along with {{KW|LBOUND}}, is used to determine the range of valid indexes of an array.


{{PageExamples}}
{{CodeStart}}{{Cl|DIM}} myArray(5) {{Cl|AS}} {{Cl|INTEGER}}
{{Cl|DIM}} myOtherArray(1 to 2, 3 to 4) {{Cl|AS}} {{Cl|INTEGER}}

{{Cl|PRINT}} {{Cl|UBOUND}}(myArray)
{{Cl|PRINT}} {{Cl|UBOUND}}(myOtherArray, 2)
{{CodeEnd}}
{{OutputStart}} 5
 4
{{OutputEnd}}


{{PageSeeAlso}}
* {{KW|Arrays}}, {{KW|LBOUND}}
* {{KW|DIM}}, {{KW|COMMON}}, {{KW|STATIC}}, {{KW|SHARED}}


{{PageNavigation}}