C++——结构体指针

亦凉 2023-10-14 16:49 0阅读 0赞

C++中指向结构体的指针也可以称为结构体指针。C++中的结构体指针 被定义为指向存储结构体的内存块地址的指针。下面是一个相同的例子：

句法：

结构体名称\*ptr；

// 结构体的初始化如下所示

ptr = &struction_variable;

示例1：

// C++ program to demonstrate Pointer to Structure
    #include <iostream>
     
    using namespace std;
     
    struct point {
        
        int value;
    };
     
    int main()
    {
        
     
        struct point g;
        // Initialization of the structure pointer
        struct point* ptr = &g;
     
        return 0;
    }

在上面的代码中，g是struct point的一个实例，ptr是struct指针，因为它存储的是struct point的地址。

示例2：

// C++ program to Demonstrate Pointer to Structure
    #include <iostream>
    #include <stdio.h>
     
    using namespace std;
     
    // Structure declaration for
    // vertices
    struct GFG {
        
        int x;
        int y;
    };
     
    // Structure declaration for
    // Square
    struct square {
        
     
        // An object left is declared
        // with 'GFG'
        struct GFG left;
     
        // An object right is declared
        // with 'GFG'
        struct GFG right;
    };
     
    // Function to calculate area of
    // the given Square
    void area_Square(struct square s)
    {
        
        // Find the area of the Square
        // using variables of point
        // structure where variables of
        // point structure is accessed
        // by left and right objects
        int area = (s.right.x) * (s.left.x);
     
        // Print the area
        cout << area << endl;
    }
     
    // Driver Code
    int main()
    {
        
        // Initialize variable 's'
        // with vertices of Square
        struct square s = {
         {
         4, 4 }, {
         4, 4 } };
     
        // Function Call
        area_Square(s);
     
        return 0;
    }

输出  
16