import math
#
# first_digit_after_decimal:
# --------------------------
# Extracts the first digit after the decimal point from a float.
#
# Method:
# 1. Use math.modf() to split the number into fractional and integer parts.
# 2. Convert the fractional part to a string.
# 3. Index the character immediately after "0." to obtain the first digit.
#
# This approach is simple, clear, and avoids unnecessary conversions.
#
def first_digit_after_decimal(value: float) -> int:
fractional, _ = math.modf(abs(value)) # isolate fractional part
s = str(fractional) # convert to string
return int(s[2]) # character after "0."
#
# Example usage
#
f = 234.872
digit = first_digit_after_decimal(f)
print(digit)
'''
run:
8
'''
