如何在C中动态添加结构成员? [英] How to add a structure member dynamically in C?

问题描述

struct point { 
    int x;
    int y;
};

main() {
    struct point a;
    a.x = 5;
    a.y = 10;
    printf("%d %d", a.x, a.y);
}

输出:

5 10

这里如果我想动态添加一个成员 (int z) int 相同的结构.流程是怎样的?

Here if I want add a member (int z) int the same structure dynamically. What is the procedure?

我尝试过的:

struct point {
    int x;
    int y;
};

struct newpoint {
    struct point a;
    int z;
};

我已经尝试了上述步骤，通过这些步骤，我们添加了一个新成员和旧结构point 到新结构newpoint.但这不是我想要的，我想动态添加新成员相同的结构.我在一次采访中得到了这个问题.

I have tried the above steps, through which we have added a new member and the old structure point to new structure newpoint. But this is not what I want, I want to add the new member the same structure dynamically. I got this question in an interview.

推荐答案

问你这个问题的面试官让你落入陷阱.

The interviewer that asked you this has set you on a trap.

在 C 中动态定义结构"是不可能的.可以在其他语言中进行鸭子类型"，例如 JavaScript，但 C 结构是编译时定义，并且是静态的.

It's impossible to "dynamically define a struct" in C. It's possible to do "duck-typing in other languages, for example JavaScript, but C structures are compile time definitions and are as static as it gets.

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