c结构体和类的区别 C++ 结构体

#include <iostream> 
struct Product   // structure declaration 
{ 
    char name[20]; 
    float volume; 
    double price; 
}; 

int main() 
{ 
    using namespace std; 
    Product guest = 
    { 
         "C++",  // name value 
         1.8,               // volume value 
         29.9               // price value 
    };  
    Product pal = 
    { 
         "Java", 
         3.1, 
         32.9 
    };  // pal is a second variable of type Product 
    cout << "Expand your guest list with " << guest.name; 
    cout << " and " << pal.name << "!n"; 
    cout << "You can have both for $"; 
    cout << guest.price + pal.price << "!n"; 
    return 0; 
} 

#include <iostream> 
using namespace std; 
struct Product 
{ 
     char name[20]; 
     float volume; 
     double price; 
}; 
int main() 
{ 
     
     Product bouquet = { "C++", 0.20, 12.49 }; 
     Product choice; 
     cout << "bouquet: " << bouquet.name << " for $"; 
     cout << bouquet.price << endl; 

     choice = bouquet;  // assign one structure to another 
     cout << "choice: " << choice.name << " for $"; 
     cout << choice.price << endl; 
     return 0; 
} 

#include <iostream> 
using namespace std; 
struct Product
{ 
     char name[20]; 
     float volume; 
     double price; 
}; 
int main() 
{ 
    Product guests[2] =          // initializing an array of structs 
    { 
         {"A", 0.5, 21.99},      // first structure in array 
         {"B", 2,   5.99}  // next structure in array 
    }; 

    cout << "The guests " << guests[0].name << " and " << guests[1].name 
          << "nhave a combined volume of " 
          << guests[0].volume + guests[1].volume << " cubic feet.n"; 
    return 0; 
}