可否分为n偶数斤西瓜

àì夳堔傛蜴生んèń 2022-04-06 18:24 213阅读 0赞

题目：  
One hot summer day Pete and his friend Billy decided to buy a watermelon. They chose the biggest and the ripest one, in their opinion. After that the watermelon was weighed, and the scales showed w kilos. They rushed home, dying of thirst, and decided to divide the berry, however they faced a hard problem.  
Pete and Billy are great fans of even numbers, that’s why they want to divide the watermelon in such a way that each of the two parts weighs even number of kilos, at the same time it is not obligatory that the parts are equal. The boys are extremely tired and want to start their meal as soon as possible, that’s why you should help them and find out, if they can divide the watermelon in the way they want. For sure, each of them should get a part of positive weight.

Input  
The first (and the only) input line contains integer number w (1 ≤ w ≤ 100) — the weight of the watermelon bought by the boys.

Output  
Print YES, if the boys can divide the watermelon into two parts, each of them weighing even number of kilos; and NO in the opposite case.

在考虑西瓜斤数为单数时，平分为两份会生成小数，为了避免小数部分被切除，应该用小数型（double/float)来计算。

不可以直接使用“%2.0”来计算，是因为%仅仅使用于整数型，不可用于小数。  
小数计算求余，使用fmod函数，开头加\#include,可引入使用。

在判断时，若x<=2,其值求余也会是0。为避免出现计算出错，应该将x<=2的情况分开了，用“ || ”表示或，组成结果为NO的条件。

通过的程序如下：  
![通过的程序][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzOTY1NTc0_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzOTY1NTc0_size_16_color_FFFFFF_t_70]: /images/20220406/060d1804710941b6ba950035b427e784.png