RosettaCodeData/Task/Sudan-function/Yabasic/sudan-function.basic

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for n = 0 to 1
print "Values of F(", n, ", x, y):"
print "y/x 0 1 2 3 4 5"
print "----------------------------"
for y = 0 to 6
print y, " | ";
for x = 0 to 5
print F(n,x,y) using ("###");
next x
print
next y
print
next n
print "F(2,1,1) = ", F(2,1,1)
print "F(3,1,1) = ", F(3,1,1)
print "F(2,2,1) = ", F(2,2,1)
end
sub F(n, x, y)
if n = 0 return x + y
if y = 0 return x
return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
end sub