【发布时间】：2017-04-03 00:59:24
【问题描述】：
嗯，我只学了 2 个月的 C 编程。我在这里得到的代码是解决收银员系统的问题。我得到了一些条形码编号、商品名称和价格。收银员输入多个条形码并以 F 结束后，应显示带有项目编号、代码和价格的收据。 这些是我编译的代码。但是，我只能输入一个条形码，程序就崩溃了。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
typedef struct goods
{
char goods_code[6];
char goods_descrip[20];
float price;
}goodtype;
goodtype goods[13];
strcpy(goods[0].goods_descrip, "Chicken");
strcpy(goods[0].goods_code, "00310");
goods[0].price = 35.00;
strcpy(goods[1].goods_descrip, "Pork");
strcpy(goods[1].goods_code, "00311");
goods[1].price = 20.50;
strcpy(goods[2].goods_descrip, "Beef");
strcpy(goods[2].goods_code, "00322");
goods[2].price = 45.00;
strcpy(goods[3].goods_descrip, "Fish");
strcpy(goods[3].goods_code, "00323");
goods[3].price = 40.00;
strcpy(goods[4].goods_descrip, "Walmart T Shirt");
strcpy(goods[4].goods_code, "00510");
goods[4].price = 75.00;
strcpy(goods[5].goods_descrip, "Walmart Trousers");
strcpy(goods[5].goods_code, "00511");
goods[5].price = 120.00;
strcpy(goods[6].goods_descrip, "Walmart Coat");
strcpy(goods[6].goods_code, "00512");
goods[6].price = 100.00;
strcpy(goods[7].goods_descrip, "Walmart Jumper");
strcpy(goods[7].goods_code, "00513");
goods[7].price = 85.00;
strcpy(goods[8].goods_descrip, "Mug");
strcpy(goods[8].goods_code, "00710");
goods[8].price = 15.50;
strcpy(goods[9].goods_descrip, "Fry Pan");
strcpy(goods[9].goods_code, "00711");
goods[9].price = 200.00;
strcpy(goods[10].goods_descrip, "Bowl");
strcpy(goods[10].goods_code, "00712");
goods[10].price = 25.00;
strcpy(goods[11].goods_descrip, "Dish");
strcpy(goods[11].goods_code, "00713");
goods[11].price = 25.00;
char tempCode[6];
char receiptNM[20], receiptCD[6];
char stop[2] = {"F"};
float receiptPC, ttlcost = 0;
unsigned int i;
printf("Please enter the item code. Type F to finish");
scanf("%s", &tempCode);
while ( strcmp(tempCode, stop) ){
for (i = 0; i <= 12; ++i){
if (strcmp(tempCode, goods[i].goods_code) == 0){
strcpy(receiptNM, goods[i].goods_descrip);
strcpy(receiptCD, goods[i].goods_code);
receiptPC = goods[i].price;
ttlcost += goods[i].price;
}
else{
printf("This item code does not exist! Try again!\n");
}
printf("Please enter the item code. Type F to finish");
scanf("%s", &tempCode);
}
printf("_____________________________________\n\n");
printf(" THANK YOU FOR VISITING US! \n");
printf("_____________________________________\n");
printf(" Here is your receipt: \n\n");
printf("%10s%20s%10s", "Item", "Code", "Price");
printf("%10s%20s%10.2f\n", receiptNM, receiptCD, receiptPC);
printf("\n_____________________________________\n");
printf(" TOTAL COST:%.2f \n", ttlcost);
}
我为此苦苦挣扎了好几个小时，无法解决。 示例输出应为Sample receipt
当我输入 00310 时，程序无法识别它。当我输入 310 时，它可以。
此外，当键入的代码不存在时，错误消息应该只显示一次。但在我的程序中，它执行了 12 次。
【问题讨论】：
-
scanf("%c", &tempCode);扫描单个字符，而不是字符串。也就是说，tempCode不会是一个以 NUL 结尾的字符串。所以你不能在上面使用任何字符串函数。 -
你的输出是什么，你预计会怎样解释这一点。 @Sam.W
-
另外，建议您学习使用调试器（如果您还没有）。这将为您节省大量时间。
-
编译时包含所有警告和调试信息（例如，如果使用 GCC，则为
gcc -Wall -Wextra -g）。改进代码，直到您没有收到任何警告。了解如何使用调试器 (gdb)。 阅读documentation