SWord Function

Purpose

Sign extension of an unsigned word (Card).

Syntax

% = SWord(value)

Description

Expansion of a Card to a Long. The output value is in the range -32768 to +32767. This will be carried out by the copying of bit 15 (=sign bit) into the bits 16 to 31.

Example

OpenW 1

Local a As Card

a = 12345 - 28784

Print Bin$(a, 32)           // 00000000000000001011111111001001

Print Bin$(SWord(a), 32)    // 11111111111111111011111111001001

Remarks

This function loads the value into the eax register and performs a CDWE assembler instruction to extend the lower 16 bits to the upper 16 bits.

See Also

Byte(), Card(), Short(), UShort(), UWord(), Word()

{Created by Sjouke Hamstra; Last updated: 04/03/2017 by James Gaite}