Условие
Whole numbers divisible by 2 are even; other whole numbers are odd. A number with a fractional part is neither. Zero is even, and negative integers follow the same rule.
Implement number_parity(number).
Input
number: The number to classify.
Output
Return odd, even, or neither as lowercase text.
Ограничения
−1,000,000 ≤ number ≤ 1,000,000. The input is finite and has at most two decimal places.
Примеры
Ввод:
number = 14
Ожидаемый вывод:
expected = "even"Ввод:
double number = 14;
Ожидаемый вывод:
std::string expected = "even";Ввод:
double number = 14;
Ожидаемый вывод:
string expected = "even";Пояснение
14 = 2 × 7, so it is divisible by 2.
Ввод:
number = 3.5
Ожидаемый вывод:
expected = "neither"Ввод:
double number = 3.5;
Ожидаемый вывод:
std::string expected = "neither";Ввод:
double number = 3.5;
Ожидаемый вывод:
string expected = "neither";Пояснение
3.5 has a fractional part, so it is neither an odd nor an even integer.
Как подступиться
Сначала попробуйте сами, затем открывайте подсказки по одной.
Подсказка 1
First decide whether the input is a whole number, since fractional values are neither odd nor even.
Подсказка 2
For whole numbers, parity depends on whether division by 2 leaves a remainder.
Подсказка 3
Remember that zero is even, and negative integers follow the same rule as positive ones.
Ожидаемая сложность
O(1) time, O(1) extra space
Ссылки
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