这是一个判断某一年是否为润年的程序，运行可执行程序Ifleap.exe后，输入具体的年份， 可输出是本年是否为闰年的提示信息。-This is a year to determine whether a leap year of the program, run the executable Ifleap.exe, enter the specific year, output this year is a leap year is the message.