Console.WriteLine("输入本金:");
var total = float.Parse(Console.ReadLine());
Console.WriteLine("输入年利率(请以%结束):");
var APR = Console.ReadLine().Trim() ;
if (APR.Contains("%"))
{
var apr = float.Parse(APR.TrimEnd('%')) / 100;
total += total * apr;
Console.WriteLine(total.ToString());
Console.Read();
}
如果输入错误值,程序会直接退出