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-rw-r--r-- | scratch/facebook/hard/binary-adder.py | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/scratch/facebook/hard/binary-adder.py b/scratch/facebook/hard/binary-adder.py new file mode 100644 index 000000000000..f79a9f22b38b --- /dev/null +++ b/scratch/facebook/hard/binary-adder.py @@ -0,0 +1,22 @@ +import random + +def add(a, b): + """ + Return the sum of `a` and `b`. + """ + if b == 0: + return a + sum = a ^ b + carry = (a & b) << 1 + return add(sum, carry) + +################################################################################ +# Tests +################################################################################ + +for _ in range(10): + x, y = random.randint(0, 100), random.randint(0, 100) + print("{} + {} = {} == {}".format(x, y, x + y, add(x, y))) + assert add(x, y) == x + y + print("Pass!") +print("Success!") |