Log2

Return 2-based logarithm

Declaration

Source position: math.pp line 389

  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.

See also

Name Description
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.

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.