在C++中，结构和类基本相同。但也有一些细微的差别。这些差异如下所示。

• 默认情况下，类成员是私有的，但结构体的成员是公共的。让我们看看这两个代码，看看有什么不同。

示例

#include <iostream>
using namespace std;
class my_class {
   int x = 10;
};
int main() {
   my_class my_ob;
   cout << my_ob.x;
}

输出

This program will not be compiled. It will generate compile time error for
the private data member.

示例

#include <iostream>
using namespace std;
struct my_struct {
   int x = 10;
};
int main() {
   my_struct my_ob;
   cout << my_ob.x;
}

输出

10

• When we derive a structure from a class or structure, the default access specifier of that base class is public, but when we deriving a class the default access specifier is private.

示例

#include <iostream>
using namespace std;
class my_base_class {
   public:
   int x = 10;
};
class my_derived_class : my_base_class {
};
int main() {
   my_derived_class d;
   cout << d.x;
}

输出

This program will not be compiled. It will generate compile time error that the variable x of the base class is inaccessible

示例

#include <iostream>
using namespace std;
class my_base_class {
   public:
   int x = 10;
};
struct my_derived_struct : my_base_class {
};
int main() {
   my_derived_struct d;
   cout << d.x;
}

输出

10