Real constants and functions: Difference between revisions

=={{header|Logo}}==

{{works with|UCB Logo}}

make "e exp 1

make "pi 2*(RADARCTAN 0 1)

sqrt :x

ln :x

exp :x

; there is no standard abs, floor, or ceiling; only INT and ROUND.

power :x :y

=={{header|Metafont}}==

<lang metafont>

show mexp(256); % outputs e; since MF uses mexp(x) = exp(x/256)

show 3.14159; % no pi constant built in; of course we can define it

% in several ways... even computing

% C/2r (which would be funny since MF handles paths,

% and a circle is a path...)

show sqrt2; % 1.41422, or in general sqrt(a)

show mexp(256*x); % see e.

show abs(x); % returns |x| (the absolute value of the number x, or

% the length of the vector x); it is the same as

% length(x); plain Metafont in fact says:

% let abs = length;

show floor(x); % floor

show ceiling(x); % ceiling

show x**y; % ** is not a built in: it is defined in the basic macros

% set for Metafont (plain Metafont) as a primarydef

</lang>