Unit 'Math'	Package
[Overview][Constants][Types][Classes][Procedures and functions][Index]	[#rtl]

Log2

Return 2-based logarithm.

Declaration

Source position: math.pp line 591

function Log2(

x: Float

):Float;

Description

Log2 returns the 2-base logarithm of X.

Errors

If x is less than or equal to 0 an 'invalid fpu operation' error will occur.

Example

Program Example22;

{ Program to demonstrate the log2 function. }

Uses math;

begin
  Writeln(Log2(2):8:4);
  Writeln(Log2(4):8:4);
  Writeln(Log2(8):8:4);
  Writeln(Log2(1):8:4);
  Writeln(Log2(0.5):8:4);
  Writeln(Log2(0.25):8:4);
  Writeln(Log2(0.125):8:4);
end.

ldexp		Return (2 to the power p) times x.
lnxp1		Return natural logarithm of 1+X.
log10		Return 10-Based logarithm.
logn		Return N-based logarithm.

Log2

Declaration

Description

Errors

See also

Example