using System;
class CalcPay
{    public static void Main(string[]args)
    {    int coat,trousers,money;
         Console.WriteLine("Enter coat number:");
         coat = Convert.ToInt32(Console.ReadLine());
         Console.WriteLine("Enter trousers number:");
         trousers = Convert.ToInt32(Console.ReadLine());
         money = getPay(coat,tousers);
         Console.WriteLine("total money = {0}",money);
    }
    public static int getPay(int c, int t)
     {
        int r;
        if(t>c)
            if(c>50)
               r=c*80+(t-c)*45;
            else
                r=c*90+(t-c)*45;
        else
            if(t>50)
                r=t*80+(c-t)*60;
            else
                r=t*80+(c-t)*60;
   }

}
上面的代码。系统显示第二个getPay那里出错。不是所有的程序都有返回值。该怎么改。