编写函数，对实型数组进行降序排序。主函数输入一个实型数组，调用函数完成排序，主函数中要求输出排序结果（必须要函数调用）-Write functions, of real array sorted in descending order. The main function is to enter a real array, the function is called to complete the sort required output sort results (must function in the main function call)