1  #include <stdio.h>
2  #include <ctype.h>                              //ABC Mail Order Grocery朝鲜蓟的售价是1.25美元/磅，甜菜的售价是0.65美元/磅，胡萝卜的售价是0.89美元/磅。
3  #define ARTICHOKE 1.25                          // 在添加运输费用之前，他们为满100美元 的订单提供5%的打折优惠。         
4  #define BEET 0.65                               //对5磅或以下的定单收取3.50美元的运输和装卸费用；超过5磅而不足20磅的定单收取1O.OO美元的运输和装卸费用：20磅 或以上的运输，在8美元基础上每磅加收0.1美元。
5  #define CARROT 0.89                            //编写程序，在循环中使用switch语句，以便对输入a的响应是让用户输入所需的朝鲜蓟磅数，b为甜菜 的磅数，c为胡萝卜的磅数，而q允许用户退出订购过程。
6  #define DISCOUNT_LIMIT 100                    //然后程序计算总费用、折扣和运输费用（如果有运输费的话），以及总数。
7  #define DISCOUNT_RATE 0.05                    //随后程序应该显示所有的购买 信息：每磅的费用、订购的磅数、该订单每种蔬菜的费用、订单的总费用、折扣，如果有的话加上运输费用，以及所有费用的总数。
8  #define FREIGHT_FEE1 3.5                           
9  #define FREIGHT_LIMIT1 5
10 #define FREIGHT_FEE2 10
11 #define FREIGHT_LIMIT2 20
12 #define FREIGHT_FEE3 8
13 #define FREIGHT_RATE3 0.1
14 int main(void)
15 {
16    char ch;
17    double artichoke=0,beet=0,carrot=0;
18    double sum,discount,freight;
19    printf("Please select your vegetables\n");
20    printf("a.artichoke:$%.2f\n",ARTICHOKE);
21    printf("b.beet:$%.2f\n",BEET);
22    printf("c.carrot:$%.2f\n",CARROT);
23    printf("q.quit\n");
24    printf("price as dollars per pound\n");
25    while((ch=tolower(getchar())!='q')
26    {
27      switch(ch)
28      {
29        case'a':printf("How many pounds of artichoke do you want?\n");
30                      scanf("%lf",&artichoke);
31                      printf("please select your vegetables:a.b.c.q\n");
32                      continue;
33        case'b':printf("How many pounds of artichoke do you want?\n");
34                      scanf("%lf",&beet);
35                      printf("please select your vegetables:a.b.c.q\n");
36                     continue;
37        case'c':printf("How many pounds of artichoke do you want?\n");
38                      scanf("%lf",&carrot);
39                      printf("please select your vegetables:a.b.c.q\n");
40                      continue;
41        default:break;
42      }
43     }
44    printf("%10s%10s%10s%10s\n"," ","artichoke","beet","carrot");
45    printf("%10s%10.2lf%10.2lf%10.2lf\n","price",ARTICHOKE,BEET,CARROT);
46    printf("%10s%10.2lf%10.2lf%10.2lf\n","pound",artichoke,beet,carrot);
47    printf("%10s%10.2lf%10.2lf%10.2lf\n",charge,ARTICHOKE*artichoke,BEET*beet,CARROT*carrot);
48    sum=ARTICHOKE*artichoke+BEET*beet+CARROT*carrot;
49    if(sum<100)discount=0;
50    else discount=sum*DISCOUNT_RATE;
51    if(artichoke+beet+carrot<FREIGHT_LIMIT1)freight=FREIGHT_FEE1;
52    else if(artichoke+beet+carrot<FREIGHT_LIMIT2)freight=FREIGHT_FEE2;
53        else freight=8+(artichoke+beet+carrot-FREIGHT_LIMIT2)*FREIGHT_RATE3;
54    sum=sum-dicount+freight;
55   printf("the price each pound:%.2f\n",sum/(artichoke+beet+carrot));
56    printf("the pound:%.2f\n",artichoke+beet+carrot);
57    printf("the sum:%.2f\n",sum);
58    printf("discount:%.2f\n",discount);
59    return 0;
60  }

||=== Build: Debug in ABCMail (compiler: GNU GCC Compiler) ==
In function 'main':|
26|error: expected ')' before '{' token|
60|error: expected expression before '}' token|
18|warning: unused variable 'freight' [-Wunused-variable]|
18|warning: unused variable 'discount' [-Wunused-variable]|
18|warning: unused variable 'sum' [-Wunused-variable]|
17|warning: unused variable 'carrot' [-Wunused-variable]|
17|warning: unused variable 'beet' [-Wunused-variable]|
17|warning: unused variable 'artichoke' [-Wunused-variable]|
60|warning: control reaches end of non-void function [-Wreturn-type]|
||=== Build failed: 2 error(s), 7 warning(s) (0 minute(s), 0 second(s)) ===|

25    while((ch=tolower(getchar())!='q'))

为什么还要加个‘）’括号不是都齐了吗？

楼主在仔细看看，真的是右括号和右括号对齐的嘛

哦，我刚看见，明白了，谢谢，码太多，有时候容易眼花

我想执行的操作）应加在这里吧。

 while((ch=tolower(getchar()））!='q')

47    printf("%10s%10.2lf%10.2lf%10.2lf\n",charge,ARTICHOKE*artichoke,BEET*beet,CARROT*carrot);中charge好像没有定义吧  
54    sum=sum-dicount+freight;中dicount少个s
其实这些自己仔细看看都是可以解决的