罢市五个数由大到小的顺序存放到一个数组中，输入一个数，要求用折半查找法找出该数是数组中第几个元素的值。如果该数不在数组中，则打印出无此数。-Strike descending order of five numbers stored in an array, enter a number, the binary search method to find out the number of several elements in the array values. If the number i