Core Function BitSHIFT - Revision history

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2015-06-14T12:38:13Z

1 revision

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Revision as of 12:38, 14 June 2015

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2014-08-11T21:40:32Z

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UberFoX: /* Example */

2011-11-19T02:40:10Z

Example

← Older revision		Revision as of 02:40, 19 November 2011
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	println("Value is '$_'");		println("Value is '$_'");
	}		}
−
−	~~// Prints:~~
−	~~// Value is '1'~~
−	~~// Value is '3'~~
−	~~// Value is '3'~~
−	~~// Value is '7'~~
	</syntaxhighlight>		</syntaxhighlight>

	[[Category:Core Function]]		[[Category:Core Function]]

UberFoX: /* Example */

2011-11-18T01:12:58Z

Example

← Older revision		Revision as of 01:12, 18 November 2011
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	$Array[3] = (byte)($value >> 23);		$Array[3] = (byte)($value >> 23);

−	Foreach $_ ($value)	+	Foreach ($value as $_)
	{		{
	println("Value is '$_'");		println("Value is '$_'");

UberFoX: /* Remarks */

2011-11-16T22:38:49Z

Remarks

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	Right shifts are equivalent to halving; left shifts to doubling.		Right shifts are equivalent to halving; left shifts to doubling.
		+
		+	Some might wonder the point of such a function when clear << and >> operators exist but why not!.

	=== Example ===		=== Example ===

UberFoX: /* Description */

2011-11-16T22:38:00Z

Description

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	=== Description ===		=== Description ===

−	~~Calculates the arctangent of~~ a ~~number~~.	+	Performs a bit shifting operation.

	=== Parameters ===		=== Parameters ===

UberFoX: Created page with "

 BitShift ( ,  )

=== Description === Calculates the arctangent of a number. === Parameters === ==== value ==== The number to be shifted. ==== shif..."

2011-11-16T22:37:50Z

Created page with "<pre> BitShift ( <value>, <shift> ) </pre> === Description === Calculates the arctangent of a number. === Parameters === ==== value ==== The number to be shifted. ==== shif..."

New page

<pre>
BitShift ( <value>, <shift> )
</pre>

=== Description ===

Calculates the arctangent of a number.

=== Parameters ===

==== value ====

The number to be shifted.

==== shift ====

Number of bits to shift to the right (negative numbers shift left).

=== Return Value ===

Returns the value shifted by the required number of bits.

Bit operations are performed as 32-bit integers (INT32).

=== Remarks ===

Remember hex notation can be used for numbers.

Right shifts are equivalent to halving; left shifts to doubling.

=== Example ===

<syntaxhighlight lang="sputnik">
$x = BitShift(14, 2);
println( "Value is: $x" );
// x == 3 because 1110b right-shifted twice is 11b == 3

$y = BitShift(14, -2);
println( "Value is: $y" );
// y == 56 because 1110b left-shifted twice is 111000b == 56

$z = BitShift( 1, -31);
println( "Value is: $z" );
// z == -2147483648 because in 2's-complement notation, the
// 32nd digit from the right has a negative sign.
</syntaxhighlight>

Same thing but this time using the << and >> operators

<syntaxhighlight lang="sputnik">
$x = 14 >> 2;
println( "Value is: $x" );
// x == 3 because 1110b right-shifted twice is 11b == 3

$y = 14 << 2;
println( "Value is: $y" );
// y == 56 because 1110b left-shifted twice is 111000b == 56

$z = 1 << 31;
println( "Value is: $z" );
// z == -2147483648 because in 2's-complement notation, the
// 32nd digit from the right has a negative sign.
</syntaxhighlight>

Heres an interesting way to break an INT32 down into bytes using bitwise shift :

<syntaxhighlight lang="sputnik">
$value = 1337;
$Array[0] = (byte)($value);
$Array[1] = (byte)($value >> 8);
$Array[2] = (byte)($value >> 16);
$Array[3] = (byte)($value >> 23);

Foreach $_ ($value)
{
println("Value is '$_'");
}

// Prints:
// Value is '1'
// Value is '3'
// Value is '3'
// Value is '7'
</syntaxhighlight>

[[Category:Core Function]]