5-1.txt

C#实验报告 C#实验报告 C#实验报告 C#实验报告 C#实验报告 C#实验报告 C#实验报告

一个程序用于计算一年中已度过的天数，month表示月份，day表示日期，计算结果保存在total中。（为了简便，我们把闰年的情况排除在外。

C、C++程序：
total=365;
switch(month){
    case 1:total -= 31;
    case 2:total -= 28;
    case 3:total -= 31;
    case 4:total -= 30;
    case 5:total -= 31;
    case 6:total -= 30;
    case 7:total -= 31;
    case 8:total -= 31;
    case 9:total -= 30;
    case 10:total -= 31;
    case 11:total -= 30;
    case 12:total -= 31;
    default:total += day;
}


这种写法在C#中是不允许的。

C#语言：
total=365;
switch(month){
    case 1:total -= 31; goto case 2;
    case 2:total -= 28; goto case 3;
    case 3:total -= 31; goto case 4;
    case 4:total -= 30; goto case 5;
    case 5:total -= 31; goto case 6;
    case 6:total -= 30; goto case 7;
    case 7:total -= 31; goto case 8;
    case 8:total -= 31; goto case 9;
    case 9:total -= 30; goto case 10;
    case 10:total -= 31; goto case 11;
    case 11:total -= 30; goto case 12;
    case 12:total -= 31; goto default;
    default:total += day;
}

下面的程序是正确的。
switch(i){
   case 0:
          while(true)  F();
   case 1:
          throw new ArgumentException();
   case 2:
          return;
}