Xcode 结构帮助
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Xcode struct help
提问by MrWolvwxyz
So I am new to programming and even newer to Xcode. I am having trouble using a struct in Xcode. I have gotten to the point where I copied and pasted the code,
所以我是编程的新手，甚至是 Xcode 的新手。我在 Xcode 中使用结构体时遇到问题。我已经到了复制和粘贴代码的地步，
struct product {
int weight;
float price;
} ;
product apple;
from the c++ site, but when I try to declare the apple's weight via apple.weight = 5;I get errors saying unknown type name 'apple' and expected unqualified Id at .
来自 c++ 站点，但是当我尝试通过声明苹果的重量时，apple.weight = 5;我收到错误消息，说未知类型名称“苹果”和预期的不合格 Id at 。
回答by Yann Ramin
Simple: You have a structure, not a typedefstructure.
简单：你有一个结构，而不是一个typedef结构。
You can use it as follows:
您可以按如下方式使用它：
struct product {
int weight;
float price;
};
struct product apple;
void func() {
apple.weight = 12;
}
However, if you use a typedef, you can give your datatype an actual name:
但是，如果您使用 typedef，您可以为您的数据类型指定一个实际名称：
typedef struct { .. } product;
product apple;
回答by aaz
product apple;
apple.weight = 5;
This is valid code inside a function, but not at file scope.
这是函数内的有效代码，但不在文件范围内。
Although at file scope you can initialize it like this:
尽管在文件范围内，您可以像这样初始化它：
product apple = { 5 };
