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#include <iostream> using namespace std; class Person { const string name; int age; char sex; public: Person():name("zhangsan"){/*cout << "Person的无参构造" << endl;*/ } Person(const string name,int age,char sex):name(name),age(age),sex(sex) { // cout << "Person的有参构造" << endl; } ~Person() { // cout << "Person的析构函数" << endl; } void show() { cout << " name=" << name << " age=" << age << " sex=" << sex <<endl; } Person(const Person &other):name(other.name)/*,age(other.age),sex(other.sex)*/ { this->age=other.age; this->sex=other.sex; } Person &operator=(const Person &other) { if(this!=&other) { //const string nmae 构造函数时已经初始化 this->age=other.age; this->sex=other.sex; cout << "Person的拷贝赋值" <<endl; } return *this; }; }; class Stu { Person A; double *p; public: Stu():p(new double) { cout << "Stu的无造函数" << endl; } Stu(const string name,int age,char sex,double score):A(name,age,sex),p(new double(score)) { cout << "Stu的有参构造" << endl; } ~Stu() { delete p; cout << "Stu的析构函数" << endl; } void show() { cout << "p=" << p; cout << " *p=" << *p << endl; A.show(); } Stu(const Stu &other):p(new double(*(other.p))),A(other.A){} Stu &operator=(const Stu &other) { this->A=other.A; *(this->p)=*(other.p); cout << "Stu的拷贝函数" << endl; } }; int main() { // Stu t1; // t1.show(); // Stu t2("lisi",3,'s',99.9); // t2.show(); Person t3("wangwu",17,'m'); Person t4; t4=t3; t3.show(); t4.show(); Stu t5("wangwu",17,'m',88.8); t5.show(); Stu t6=t5; t6.show(); Stu t7("kenn",28,'w',77.7); Stu t8; t8=t7; t7.show(); t8.show(); return 0; }
#include <iostream> #include <cstring> #include <iomanip> #include <stdio.h> using namespace std; class myString { char *str; int size; public: myString():str(new char[32]){cout << "myString无参构造"<<endl;} myString(char *str):str(new char[32]) { strcpy(this->str,str); this->size=strlen(); cout << this->str << endl; cout << "myString有参构造"<<endl; printf("%p\n",this->str); } myString(const myString &other):str(new char[32]) { strcpy(this->str,other.str); this->size = other.size; cout << "myString拷贝构造"<<endl; printf("%p\n",this->str); } myString &operator=(const myString &other) { if(&other!=this) { strcpy(this->str,other.str); this->size=other.size; cout << "myString拷贝赋值"<<endl; printf("%p\n",this->str); } return *this; } ~myString() { delete []str; str=nullptr; cout << "myString析构函数"<<endl; } void show() { cout << "str=" << str << " size=" << size << endl; } int empty() { string s1=str; return s1.empty(); } int strlen() { string s1=str; return s1.size(); } char &at(int pos) { string s1=str; return s1.at(pos); } }; int main() { myString p1; //p1.show(); char str[32]="hello nihao"; myString p2(str); p2.show(); myString p3=p2; p3.show(); myString p4; p4=p2; p4.show(); return 0; }
