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Math Functions: The Logarithm of Base 2

     

Introduction

The Log2() function is used to calculate the logarithm of a number on base 2. The syntax of the function is:

Extended __fastcall Log2(Extended X);

The variable whose logarithmic value will be calculated is passed as argument X to the function. The function uses the formula:

Y = log2x

This is the same as

x = 2y

//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	Extended X, Result;

	X = StrToFloat(Edit1->Text);
	Result = Log2(X);
	Edit2->Text = FloatToStr(Result);
}
//---------------------------------------------------------------------------
   
     
 

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