| **Navigation:**  [[introduction.htm|Language Reference]] > 3 - Variable Declarations > Data Types >====== UINT64 (64bit unsigned integer) ====== | [[int64.htm|{{btn_prev_n.gif|Previous page}}]][[introduction.htm|{{btn_home_n.gif|Return to chapter overview}}]][[signed  16 32 bit signed integer .htm|{{btn_next_n.gif|Next page}}]] |
|  ||

Coming in a future release

| label | **UINT64(**[//initial value//]**)** | [,**DIM( )**] [,**OVER( )**] [,**NAME( )**] [,**EXTERNAL**] [,**DLL**] [,**STATIC**] |
|  |  | [,**THREAD**] [,**AUTO**] [,**PRIVATE**] [,**PROTECTED**] |

{{blk2blue.jpg|blk2blue.jpg}}

| **UINT64** | A 64bit unsigned integer. Uses 8 bytes of memory. |

Range: 0 to 9,223,372,036,854,775,807

| //initial value// | A numeric constant. If omitted, the initial value is zero, unless the AUTO attribute is present. |
| **DIM** | Dimension the variable as an array. |
| **OVER** | Share a memory location with another variable. |
| **NAME** | Specify an alternate, "external" name for the field. |
| **EXTERNAL** | Specify the variable is defined, and its memory is allocated, in an external library. Not valid within FILE, QUEUE, or GROUP declarations. |
| **DLL** | Specify the variable is defined in a .DLL. This is required in addition to the EXTERNAL attribute. |
| **STATIC** | Specify the variable's memory is permanently allocated. |
| **THREAD** | Specify memory for the variable is allocated once for each execution thread. Also implicitly adds the STATIC attribute on Procedure Local data. |
| **AUTO** | Specify the variable has no //initial value//. |
| **PRIVATE** | Specify the variable is not visible outside the module containing the CLASS methods. Valid only in a CLASS. |
| **PROTECTED** | Specify the variable is not visible outside base CLASS and derived CLASS methods. Valid only in a CLASS. |

**UINT64** declares an eight-byte unsigned integer. There is no sign bit in this configuration.

** 64-bits integer constants can't be used in an ITEMIZE structure.

** 64-bits integer constants and EQUATEs are not allowed in expressions in OMIT/COMPILE directives.

** EQUATEs naming 64-bits integer constants are supported.

**Example:**

**Count1 UINT64                        !Declare 64bit unsigned integer**

**Count3 UINT64,DIM(4)                 !Declare it an array of 4 **

**Count4 UINT64(5)                     !Declare with initial value**

**Count5 UINT64,EXTERNAL               !Declare as external**

**Count6 UINT64,EXTERNAL,DLL           !Declare as external in a .DLL**

**Count7 UINT64,NAME('SixCount')       !Declare with external name**

**see also: [[int64.htm|INT64]]**