1. 实现一个函数，打印乘法口诀表，口诀表的行数和列数自己指定， 输入9，输出9*9口诀表，输出12，输出12*12的乘法口诀表。 2. 使用函数实现两个数的交换。 3. 实现一个函数判断year是不是润年。 4. 创建一个数组， 实现函数init（）初始化数组、 实现empty（）清空数组、 实现reverse（）函数完成数组元素的逆置。 要求：自己设计函数的参数，返回值。 5.实现一个函数，判断一个数是不是素数。
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