今天学习了一个叫做Switch case 的小东西
通俗地来讲就是一个选择箱
可以选择东西

Switch (XXXXX)

简单的来说就是这一个简单的语句
下面用一个小例子来说明
比如说需要做一个菜单

1. pizza - 45 RMB
2. croissant - 45 RMB
3. Dount - 10 RMB
4. pastry - 15 RMB
5. bread - 12 RMB

6. coffer jackry like most - 6 RMB
   来表示不同的东西的不同价格
   用户可以自行输入数字来表示他们需要什么东西
   然后程序就会做一个加法
   将菜品的价格加起来

   #include<stdio.h>
   void main ()
   {
   int choice = 0;
   int total_bill = 0;
   do
   {

    printf ("****************MENU****************\n");
    printf ("1.Pizza                    45 RMB\n");
    printf ("2.Corissant                45 RMB\n");
    printf ("3.Dount                    10 RMB\n");
    printf ("4.Pastry                15 RMB\n");
    printf ("5.Bread                    12 RMB\n");
    printf ("6.coffer jackry like most        6 RMB\n");
    printf ("************************************\n");
    printf ("input 0 to exit or finish\n");
    scanf ("%d",&choice);//i want to use same variable in all conditions
    switch (choice)//check the calue of choice
    {
        case 1: //what to do if the vaule is 1
        {
            total_bill += 45;//total_bill = total_bill + 45
            printf ("½«Pizz¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;//break the case ´òÆƺÐ×ÓÌÓ³öÀ´ 
        }//c will do this while the vaule is 1
        case 2:
        {
            total_bill += 45;//total_bill = total_bill + 45
            printf ("½«Corissant¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;
        }
        case 3:
        {
            total_bill += 10;//total_bill = total_bill + 45
            printf ("½«Dount¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;
        }
        case 4:
        {
            total_bill += 15;//total_bill = total_bill + 45
            printf ("½«Pastry¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;
        }
        case 5:
        {
            total_bill += 12;//total_bill = total_bill + 45
            printf ("½«Bread¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;
        }
        case 6:
        {
            total_bill += 6;//total_bill = total_bill + 45
            printf ("½«Delicious coffee¼ÓÈëºÀ»ªÎç²Í\n");
            printf ("------------------------------\n");
            printf ("µ±Ç°×ܽð¶îΪ:");
            printf ("%d\n",total_bill);
            printf ("------------------------------\n");
            break;
        }
    }

   }
   while (choice != 0);
   printf ("µ±Ç°×ܽð¶îΪ:%d\n",total_bill);
   printf ("please choice a way to pay ");
   }