VCL Math Functions: The Logarithm of Base 10

	Math Functions: The Logarithm of Base 10

Introduction

The Log10() function calculates the base 10 logarithm of a number. The syntax of this function is:

Extended __fastcall Log10(Extended X);

The number to be evaluated is passed as the argument X. The function returns the logarithm on base 10 using the formula:

y = log10x

which is equivalent to

x = 10^y

Here is an example:

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

	X = StrToFloat(Edit1->Text);
	Result = Log10(X);
	Edit2->Text = FloatToStr(Result);
}
//---------------------------------------------------------------------------