划红线处是怎么回事呢？求解答

划红线处怎么回事？

#include <iostream>
using namespace std;
#include <cstring>

class Date {
    private:
        int year, month, day;
    public:
        Date(int year = 0, int month = 0, int day = 0) {
            this->year = year;
            this->month = month;
            this->day = day;
        }

        void setDate() {
            cin >> year >> month >> day;
        }
        void showDate() {
            cout << year << "年" << month << "月" << day << "日";
        }

        ~Date() {}
};

class People {
    private:
        char name[11];
        char number[7];
        char sex[3];
        char id[19];
        Date birthday;
    public:
        People() {

        }
        People(char na[], char num[], char se[], int y, int m, int d, char i[]): birthday(y, m, d) {
            strcpy(name, na);
            strcpy(number, num);
            strcpy(sex, se);
            strcpy(id, i);

        }
        People(People &p) {
            strcpy(name, p.name);
            strcpy(number, p.number);
            strcpy(sex, p.sex);
            strcpy(id, p.id);
            birthday = p.birthday;
        }




        //录入人员信息
        void input() {
            cout << "姓名：";
            cin >> name;
            //cout << endl;
            cout << "编号：";
            cin >> number;
            //cout << endl;
            cout << "性别(男/女): ";
            cin >> sex;
            //cout << endl;
            cout << "出生日期（年 月 日）：";

            birthday.setDate();
            //cout << endl;
            cout << "身份证号：";
            cin >> id;
            //cout << endl;


        }
        void showPeople() {
            cout << endl;
            cout << "姓名：" << name << endl;

            cout << "编号：" << number << endl;
            cout << "性别：" << sex << endl;
            cout << "出生日期: ";
            birthday.showDate();
            cout << endl;
            cout << "身份证号：" << id;
        }
        ~People() {}
};

int main() {
    int n;//员工数
    cout << "员工人数: ";
    cin >> n;
    //cout << endl;
    People *p;
    p = new People[n];
    for (int i = 0; i < n; i++) {
        p[i].input();

    }
    People p1(p[0]);
    p1.showPeople();
    for (int i = 0; i < n; i++) {
        p[i].showPeople();
    }
    return 0;
}

我的解答思路和尝试过的方法

我想要达到的结果

char sex[3]; 改成 char sex[4]; 就可以了。

怎么会在性别后面打印身份证号呢？好奇怪