单击 "第一题"后，统计正数数组的个数、总和、最大数、最小数。

单击"第二题"后，随机产生50个100-300之间的随机整数,将它们中的偶数放入另一个数组，再对偶数数组按从大到小的顺序进行排序。

单击"第三题"后，在数组中找出该数并删除若数组中没有该数，输出"无此数据"。

-Click the " first question" , the number of positive array of statistics, the sum of the maximum number, the smallest number. Click the " second question" , the randomly generated 50 random integers between 100-300, even put them in another array, and then the even-numbered array sorted in descending order. Click the " third question"　post, to find the number in the array and the array is not deleted if the number of outputs " no such data."