66: How do I get a base 10 logarithm in TP?
A: Just define
function log (x : real) : real;
begin log := ln(x) / ln(10); end;
This result is based on some elementary math. By definition
y = log(x) in base 10 is equivalent to x = 10^y (where the ^
indicates an exponent). Thus ln(x) = y ln(10) and hence
y = ln(x) / ln(10).
