This is just one of many possible solutions:
when green flag clicked
ask [Please enter a decimal number:] and wait
set [decimal number v] to (answer)
set [bit value v] to [1]
repeat until <(decimal number) < (bit value)>
set [bit value v] to ((bit value) * (2))
end
repeat until <(bit value) = [1]>
set [bit value v] to ((bit value) / (2))
if <<(decimal number) > (bit value)> or <(decimal number) = (bit value)>> then
play note (72 v) for (0.5) beats
set [decimal number v] to ((decimal number) - (bit value))
else
play note (48 v) for (0.5) beats
end
end