Math Functions: The Natural Logarithm of a Number



The LnXP1() function is used to calculate the natural logarithm of a number that is being incremented to 1. The syntax of this function is

Extended __fastcall LnXP1(Extended X);

When executing, this function takes one argument, X, adds 1 to X, and then calculates the natural logarithm, also called the Napierian logarithm, of the new number. The formula used is

Result = ln(X+1)

Here is an example:

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

	X = StrToFloat(Edit1->Text);
	Result = LnXP1(X);
	Edit2->Text = FloatToStr(Result);



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