Iso iec14882 -2003 9类 §3 结构是用定义的类 类键结构体;它的成员 基类(第10条)是 默认为公开(第11条)。

类的成员默认为private。Struct的成员默认为public。除此之外，没有其他区别。还有这个问题。

这里有一个很好的解释:http://carcino.gen.nz/tech/cpp/struct_vs_class.php

所以，再强调一次:在c++中，结构体与类是相同的，除了结构体的成员默认具有公共可见性，而类的成员默认具有私有可见性。

. In classes all the members by default are private but in structure members are public by default. There is no term like constructor and destructor for structs, but for class compiler creates default if you don't provide. Sizeof empty structure is 0 Bytes wer as Sizeof empty class is 1 Byte The struct default access type is public. A struct should typically be used for grouping data. The class default access type is private, and the default mode for inheritance is private. A class should be used for grouping data and methods that operate on that data. In short, the convention is to use struct when the purpose is to group data, and use classes when we require data abstraction and, perhaps inheritance. In C++ structures and classes are passed by value, unless explicitly de-referenced. In other languages classes and structures may have distinct semantics - ie. objects (instances of classes) may be passed by reference and structures may be passed by value. Note: There are comments associated with this question. See the discussion page to add to the conversation.

Iso iec14882 -2003 9类 §3 结构是用定义的类 类键结构体;它的成员 基类(第10条)是 默认为公开(第11条)。

还有一个不成文的规则告诉我们: 如果类的数据成员与自身没有关联，则使用struct。 如果数据成员的值依赖于另一个数据成员的值，则使用class。

f.e

class Time
{
    int minutes;
    int seconds;
}

struct Sizes
{
    int length;
    int width;
};