利用C语言模拟一个Javabean
仅封装了，“无参构造函数”，“带参构造函数”,"toString方法"
#include <stdio.h>
struct User{
int ID;
char *name;
char *password;
int age;
};
void newUser(struct User *,const int ,const char *,const char *,const int);
void printUserInfo(struct User *);
void copyUser(struct User *,const struct User *);
int main(){
//char *p;
//printf("%d", sizeof(p));
//char p[10];
//strcpy(p, NULL); 不合法
//BasePart
struct User user1;
user1.ID = ;
char name1[] = "lifei";
//printf("%d\n", sizeof(name1));
user1.name = malloc(sizeof(name1));
printf("sizeof(user1.name)： %d 个字节\n", sizeof(user1.name));//*user1.name 首地址就1个字节。
printf("user1.name占地： %d 个字节\n", strlen(user1.name));//为什么是24个字节呢，刚刚分配过来，就是有很大？
strcpy(user1.name, name1);
printf("sizeof(user1.name)： %d 个字节\n", sizeof(user1.name));//*user1.name 首地址就1个字节。
printf("user1.name占地： %d 个字节\n", strlen(user1.name));//这里就比较好，结果是5
char password1[] = "";
user1.password = malloc(sizeof(password1));
strcpy(user1.password, password1);
user1.age = ;
printUserInfo(&user1);
//printf(user1.name);
/*printf("%s\n", user1.name);
printf("%p\n", user1.name);
printf("%d\n",sizeof(user1.name));*/
//struct User user2;
//user2 = user1;//因为不面向对象，所以不可能点出来，所以 要传递两个对象进去对嘛
//user2.ID = 3;
//strcpy(user1.name, "rio");//这里越界有个异常，最好自己写个啥，然后就按之前视频里演示的那样，新来谁，就把谁创建，再赋值进去。TODO
//printUserInfo(&user2);
//printUserInfo(&user1);
//这种修改 肯定不行，仅年龄跟id改了，但是姓名跟密码是一起改的，所以，姓名跟密码要指定新的位置。
struct User user2;
copyUser(&user2, &user1);//以上两句话相当于 ：User user2 = new User（user1）；
strcpy(user1.name, "rio");
user2.ID = ;
printUserInfo(&user2);//相当于toString();还是重载过的
printUserInfo(&user1);
struct User user3;
newUser(&user3, ,"reeven", "qwerty", );//以上两句话，相当于 User user3 = new User(3,"reeven", "qwerty", 28);
printUserInfo(&user3);
free(user1.name);
free(user1.password);
free(user2.name);
free(user2.password);
free(user3.name);
free(user3.password);
getchar();
return ;
}
void copyUser(struct User *dest, const struct User *src){
dest->ID = src->ID;
//printf("%s\n", src->name);
//printf("%d\n", sizeof(src->name));
//printf("%d\n", sizeof(*(src->name)));
dest->name = malloc(strlen(src->name)+);//+1表示\0
if (src->name != NULL){
strcpy(dest->name, src->name);
}
dest->password = malloc(strlen(src->password) + );
if (src->password != NULL){
strcpy(dest->password, src->password);
}
dest->age = src->age;
}
void printUserInfo(const struct User *user){
printf("用户信息：id:%d,用户名：%s,密码:%s,年龄：%d\n", user->ID, user->name, user->password, user->age);
}
/**
相当于构造函数了。。。
*/
void newUser(struct User *user,const int id, const char *name, const char *password,const int age){
user->ID = id;
user->name = malloc(strlen(name) + );
if (name != NULL){
strcpy(user->name, name);
}
user->password = malloc(strlen(password) + );
if (password != NULL){
strcpy(user->password, password);
}
user->age = age;
}