Qu is a computer programming language with an open-source interpreter written in C by Marc Krisnanto. It is comparable to Python, Ruby, Perl and many others.
The language is semi-dynamic, and optionally strongly typed, with full object orientation. All variables in the language are first class objects.
The design and implementation focuses on compactness and speed, using the GNU Lightning Just In Time compiler (JIT).
if not (__arg__) # get input;
println("Ackermann's function ...")
println("Enter a number on the command line!")
NUM = Int(__arg__)
printf('Ack (3,%d): %d\n', NUM, Ack(3, NUM))
sub Ack(m, n) # one way
if m == 0 return n + 1
elif n == 0 return Ack(m - 1, 1)
else return Ack(m - 1, Ack(m, n - 1));;
# alternate way
sub ackermann (m, n)
return m ? (n ? ackermann (m - 1, ackermann (m, n - 1)) :
ackermann (m - 1, 1)) : n + 1