C++ 封装

#include <stdio.h>

struct student {
        int a;
        int b;
        int add(){  //在结构体内封装了函数 
            return a+b;
        }
    };

int main(){
    
    struct student s={10,20}; 
    int x=s.add();
    
    printf("%d\n",x);
    
}