The [_MEMPUT](_MEMPUT) statement writes data to a portion of a designated memory block at an [OFFSET](OFFSET) position.

## Syntax

> [_MEMPUT](_MEMPUT) memoryBlock, bytePosition, sourceVariable [AS type]

## Parameter(s)

* memoryBlock is a [_MEM](_MEM) variable type memory block name created by [_MEMNEW](_MEMNEW) or the [_MEM (function)](_MEM-(function)) function.
* bytePosition is the memoryBlock.[OFFSET](OFFSET) start position plus any bytes needed to read specific values. 
* The sourceVariable type designates the size and bytePosition it should be written to. It can be a variable, [arrays](arrays) or user defined type.
* bytePosition can be converted [AS](AS) a specific variable *[TYPE](TYPE)* before being written to the memoryBlock as bytes.

## Description

* The _MEMPUT statement is similar to the [PUT](PUT) file statement, but bytePosition is required.
* The memoryBlock.[OFFSET](OFFSET) returns the starting byte position of the block. Add bytes to move into the block.
* The variable type held in the memory block can determine the next *byte position* to write a value. 
* [LEN](LEN) can be used to determine the byte size of numerical or user defined variable [Variable Types](Variable-Types)s regardless of the value held.
* [STRING](STRING) values should be of a defined length. Variable length strings can actually move around in memory and not be found.

## Example(s)

_MEMPUT can be used just like [POKE](POKE) without [DEF SEG](DEF-SEG).

```vb

DIM o AS _MEM
o = _MEM(d&)
_MEMPUT o, o.OFFSET + 1, 3 AS _UNSIGNED _BYTE  'POKE
v = _MEMGET(o, o.OFFSET + 1, _UNSIGNED _BYTE) 'PEEK
PRINT v 'prints 3
PRINT d& 'print 768 because the 2nd byte of d& has been set to 3 or 3 * 256 

```

## See Also

* [_MEMGET](_MEMGET), [_MEMGET (function)](_MEMGET-(function))
* [_MEM](_MEM), [_MEM (function)](_MEM-(function))
* [_MEMIMAGE](_MEMIMAGE), [_MEMNEW](_MEMNEW)
* [_MEMFREE](_MEMFREE), [_MEMCOPY](_MEMCOPY)