def get_nth_decimal_digit(value: float, position: int) -> int:
"""
Return the Nth digit after the decimal point.
Examples:
get_nth_decimal_digit(123.456789, 1) -> 4
get_nth_decimal_digit(123.456789, 2) -> 5
get_nth_decimal_digit(123.456789, 3) -> 6
Args:
value: The floating-point number to inspect.
position: The digit position after the decimal point (1-based).
Returns:
The requested digit (0-9).
Raises:
ValueError: If position is less than 1.
"""
if position < 1:
raise ValueError("position must be a positive integer")
# Convert to a positive value.
value = abs(value)
# Convert the number to a string with a fixed precision.
number_str = f"{value:.15f}"
# Find the decimal point.
decimal_pos = number_str.find(".")
if decimal_pos == -1:
return 0
# Calculate the position of the requested digit.
digit_index = decimal_pos + position
# Return 0 if the digit does not exist.
if digit_index >= len(number_str):
return 0
return int(number_str[digit_index])
def main() -> None:
"""Program entry point."""
number: float = 123.456789
print(f"Number: {number}")
print()
for position in range(1, 7):
digit = get_nth_decimal_digit(number, position)
print(f"{position} digit after decimal = {digit}")
print("\nAdditional Examples")
print("-------------------")
print(
f"123.456789, position 4 -> "
f"{get_nth_decimal_digit(123.456789, 4)}"
)
print(
f"-98.7654, position 2 -> "
f"{get_nth_decimal_digit(-98.7654, 2)}"
)
print(
f"1.2, position 5 -> "
f"{get_nth_decimal_digit(1.2, 5)}"
)
if __name__ == "__main__":
main()
'''
run:
Number: 123.456789
1 digit after decimal = 4
2 digit after decimal = 5
3 digit after decimal = 6
4 digit after decimal = 7
5 digit after decimal = 8
6 digit after decimal = 9
Additional Examples
-------------------
123.456789, position 4 -> 7
-98.7654, position 2 -> 6
1.2, position 5 -> 0
'''
