How to write Python to determine odd and even numbers

The methods to use Python to determine odd and even numbers include: % remainder operator: If the number divided by 2 has a remainder of 1, it is an odd number, and a remainder of 0 is an even number. math.modulo function: Returns the remainder of the division of two numbers, equivalent to the % remainder operator but more efficient for large numbers.

How to use Python to determine odd and even numbers

In order to determine whether a number is odd or even, Python provides a simple Methods.

Use % remainder operator

• Odd numbers: When a number is divided by 2, the remainder is 1.
• Even numbers: When a number is divided by 2, the remainder is 0.

Therefore, we can use the % remainder operator to check the parity of a number. For example:

<code class="python"># 检查数字 5 是否为奇数
if number % 2 == 1:
    print("5 是奇数")
else:
    print("5 是偶数")</code>

Using the modulo function

Python also provides the math.modulo function, which returns two numbers The remainder of division. This is the same as the % remainder operator, but more efficient for large numbers.

<code class="python">import math

# 检查数字 100 是否为偶数
if math.modulo(100, 2) == 0:
    print("100 是偶数")
else:
    print("100 是奇数")</code>

Other methods

There are other methods to determine parity, for example:

• Use bit operations: binary representation of odd numbers The last digit is 1, and the last digit of even numbers is 0.
• Use logical operations: a number is XORed with 1, the result is 1 for an odd number, and the result is 0 for an even number.

But the above % remainder operator and math.modulo function are the simplest and most direct way to determine the parity of numbers.

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