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Add ´is_even(value, rc_bound)´ function to ´math_utils.py´ #65

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Add ´is_even(value, rc_bound)´ function to ´math_utils.py´ #65

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0e2899e
Add ´is_even(value, rc_bound)´ function
omarespejel May 21, 2022
5308fd6
Fix is_even, use as_int instead of assert_integer
omarespejel May 22, 2022
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9 changes: 9 additions & 0 deletions src/starkware/cairo/common/math_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,3 +23,12 @@ def is_positive(value, prime, rc_bound):
val = as_int(value, prime)
assert abs(val) < rc_bound, f"value={val} is out of the valid range."
return val > 0

def is_even(value, rc_bound):
"""
Returns true if the input is even and within the range (-rc_bound, rc_bound).
Raises an exception if the element is not within the accepted range.
"""
assert_integer(value)
assert abs(value) < rc_bound, f"value={value} is out of the valid range."
return value % 2 == 0