signed nibble

[H. S. Teoh]

On Mon, Jan 07, 2019 at 05:23:19PM +0000, Michelle Long via Digitalmars-d-learn wrote:
> Is there any direct way to convert a signed nibble in to a signed byte
> with the same absolute value? Obviously I can do some bit comparisons
> but just curious if there is a very quick way.

Assuming you have the nibble stored in the lower bits of a ubyte:

	import std.stdio;
	byte nibSgnExt(ubyte nib)
	{
		return cast(byte)(nib << 4) >> 4;
	}
	void main() {
		writefln("%02X", nibSgnExt(0x0F));
		writefln("%02X", nibSgnExt(0x07));
	}


T

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