编写C++风格的程序，解决百钱问题：将1元人民币兑换成1,2,5分的人民币，有多少种换法？以清晰的形式输出所有结果，注意钱币的输出形式（小数点后两位）。-To write C++ style program, to solve one hundred questions: 1 yuan to be converted into 1,2,5 points yuan, how many kinds of change? Output all of the results presented in legible form and to pay attention to the coins of output in the form (two decimal places).