Question

**在我添加的新代码中。我不认为有任何问题，但程序在我输入项目代码后停止了。我该怎么做才能解决这个问题？

void cart()
 {
int code, amount;
float weight, price, total_weight, total_price1;
char product[20];

switch(code)
{

case 1:
    product= "Cement";
    weight=20;
    price=18;
    break;

case 2:
    product="Concrete";
    weight=30;
    price=25;
    break;

case 3:
    product="Ceramic Tile Floor";
    weight=0.1;
    price=2.2;
    break;

case 4:
    product="Foam Insulation";
    weight=0.1;
    price=2.2;
    break;

case 5:
    product="Fibre-inforced Cement";
    weight=35;
    price=50;
    break;

case 6:
    product="Thick Glass Panel";
    weight=20;
    price=50;
    break;

case 7:
    product="Thin Glass Panel";
    weight=10.5;
    price=30;
    break;

case 8:
    product="Iron Beam";
    weight=5;
    price=10;
    break;

case 9:
    product={"Iron Rod";
    weight=1;
    price=5;
    break;

case 10:
    product="Plaster Boards";
    weight=10;
    price=15;
    break;

case 11:
    product="Quarry Tiles";
    weight=0.5;
    price=3;
    break;

case 12:
    product="Steel Beam";
    weight=5;
    price=10;
    break;

case 13:
    product="Wooden Boards";
    weight=3;
    price=5;
    break;
}

printf("\nPlease enter the amount desired:");
scanf("%d", &amount);
total_weight=weight*amount;
total_price1=price*amount;

printf("So far, the total weight and total price in the cart is %f kg & RM%0.1f", total_weight, total_price1);
}

我使用的语言是C. 以上是我的程序的代码（不是整个程序）。问题是：

.c|42|error: incompatible types when assigning to type 'char[20]' from type 'char *'|

此错误适用于所有产品系列。我做的数组错了吗？我想将变量产品设置为字符串，每种情况下产品都不同。我该如何在函数中声明变量product？

另外，我如何循环它以便如果用户想要，他可以将另一个“产品”及其数量添加到购物车。然后，将重量和价格添加到总重量和价格中。也许使用哨兵停止进入产品？

最后，有没有办法简化我的工作？

提前致谢。

以下是编辑过的代码：

    void cart()
{
int code, amount;
float weight, price, total_weight, total_price1;
char * product;

printf("\nEnter the code of the desired product:");
scanf("%d", &code);

switch(code)
{

case 1:
    strcpy(product, "Cement");
    weight=20;
    price=18;
    break;

case 2:
    strcpy(product, "Concrete");
    weight=30;
    price=25;
    break;

case 3:
    strcpy(product, "Ceramic Tile Floor");
    weight=0.1;
    price=2.2;
    break;

case 4:
    strcpy(product, "Foam Insulation");
    weight=0.1;
    price=2.2;
    break;

case 5:
    strcpy(product, "Fibre-Inforced Cement");
    weight=35;
    price=50;
    break;

case 6:
    strcpy(product, "Thick Glass Panel");
    weight=20;
    price=50;
    break;

case 7:
    strcpy(product, "Thin Glass Panel");
    weight=10.5;
    price=30;
    break;

case 8:
    strcpy(product, "Iron Beam");
    weight=5;
    price=10;
    break;

case 9:
    strcpy(product, "Iron Rod");
    weight=1;
    price=5;
    break;

case 10:
    strcpy(product, "Plaster Board");
    weight=10;
    price=15;
    break;

case 11:
    strcpy(product, "Quarry Tiles");
    weight=0.5;
    price=3;
    break;

case 12:
    strcpy(product, "Steel Beam");
    weight=5;
    price=10;
    break;

case 13:
    strcpy(product, "Wooden Board");
    weight=3;
    price=5;
    break;
}

printf("\nPlease enter the amount desired:");
scanf("%d", &amount);
total_weight=weight*amount;
total_price1=price*amount;

printf("So far, the total weight and total price in the cart is %0.2fkg & RM%0.2f", total_weight, total_price1);

}

但随后出现以下消息：

.c|45|warning: 'product' may be used uninitialized in this function [-Wuninitialized]|

在输入任何代码后，我的程序停止工作。

另外，我是否可以知道如何循环程序，以便用户可以继续输入产品和金额代码，直到他想要停止？

好。所以，我用以下代码修复了它：

char * product="Unknown";

但我的程序仍然停止工作。它不会显示总重量和价格。

Answer 1

在C中，您无法为char []分配常量字符串。例如

product= "Cement";

不正确。你应该使用

strcpy(product, "Cement");

Answer 2

更改

char product[20];

到

const char * product;

Answer 3

如果要使用字符串操作，请注意初始化的产品变量应足够大，以至少等于数据长度+ 1（对于null char）。我之所以这么说，是因为你宣布了product[20]，但"Fibre-inforced Cement";的长度是＆gt; 20

代码中的错误。我不知道它属于哪个类别

3 个答案: