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2018/09/21 - [Progamming/ C++] - [C++]copy constructor_0917
2018/09/21 - [Progamming/ C++] - [C++] operator function & assignment operator_9190
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#include<iostream>
//#include<string>
#include<cstring>
#pragma warning(disable :4996)
using namespace std;
/*
배열에 문자열을 넣을 땐 자동null설정/ 문자를 넣을땐 null 추가
*/
class Mystring {
//field
char *str;
int len;
public:
//constructor
Mystring() {
this->str = new char;
}
Mystring(const char *str) {
//Mystring one("lottery winner!"); 1번
len = strlen(str) + 1;
this->str = new char[len];//문자열 상수 길이 null전까지 복사 , 문자열 값은 null까지 복사
strcpy(this->str, str);
}
Mystring(int len, char str) {
//Mystring two(20, '$'); 2번
this->str = new char[len + 1];
for (int i = 0; i < len; i++) {
this->str[i] = len;
}
this->str[len] = NULL;
}
//copy constructor
Mystring(const Mystring &str) {
//Mystring three(one); 3번
this->len = str.len;
this->str = new char[len + 1];
strcpy(this->str, str.str);
}
//operator function
Mystring& operator+=(const char *str) {
//one += "oops"; 4번
int len2 = strlen(str);
char *str1 = new char[len]; //one 문자열을 임시 저장 할 메모리 동적 할당'
strcpy(str1, this->str);//one 문자열을 임시배열에 복사
delete[]this->str; //원래 one삭제(좀비방지) 2번
this->str = new char[len + len2 + 1]; //char 타입 메모리 동적 할당
strcat(str1, str); // one문자열+"oops"
strcpy(this->str, str1); //연결된 문자열 this->str에 복사
return *this;
}
void operator=(const Mystring& str) { //Mystring 객체로 리턴
//two = "sorry!that was" 5번.
len = strlen(str.str) + 1;
this->str = new char[len];
strcpy(this->str, str.str);
//return *this;(하거나 반환 Mystring&, return *this)
}
char& operator[] (const int index) {
// char& 반환타입결정 m 6번//
return this->str[index];
}
Mystring& operator+(const Mystring& str) {
// Mystring four; 7번
int len2 = strlen(str.str);
char *str1 = new char[len + 1];
strcpy(str1, this->str);
this->str = new char[len + len2 + 1];
strcpy(this->str, str1);//
strcat(this->str, str.str);//
delete[] str1;
return *this;
}
//constructor
Mystring(char *str, int len) {
//Mystring five(alls, 20); "all's well that ends well" 8번
this->str = new char[len + 1]; // 메모리 동적 할당 20만큼
strncpy(this->str, str, len);
this->str[len] = NULL;
}
Mystring(char *str, char *str1) {
//Mystring six(alls + 6, alls + 10); 9번, 주소값
//Mystring seven(&five[6], &five[10]); 10번, five[6](값)의 주소를 char *str로 보냄
this->len = strlen(str) - strlen(str1);
this->str = new char[len + 1];
strncpy(this->str, str, len);
this->str[len] = NULL;
}
//destructor
~Mystring() {
delete[]str;
}
//method
friend ostream& operator<<(ostream& out, Mystring &name);
friend istream& operator>>(istream &in, Mystring &name);
};
ostream& operator<<(ostream& out, Mystring &name) {
cout << name.str;
return out;
}
istream& operator>>(istream &in, Mystring &name) {
char str[100]; // char 정적 메모리 할당
cin >> str;
Mystring a(str);//객체생성
name = a; //대입
return in;
}
void main() {
Mystring one("lottery winner!");//생성자함수호출 1
cout << one << endl; //출력연산자함수호출
Mystring two(20, '$');//생성자함수호출 2
cout << two << endl;//출력연산자함수호출
Mystring three(one); // 복사생성자호출 3
cout << three << endl; //출력연산자함수호출
one += "oops"; // +=연산자함수호출 ( strcat함수 ) 4
cout << one << endl;//문자열결합
two = "sorry!that was";//대입연산자함수 호출 5
cout << two << endl;
three[0] = 'p';//[]첨자연산자함수 호출. 주소값으로 받는다 6
cout << three << endl;
Mystring four; //7
four = two + three;
cout << four << endl;
char alls[] = "all's well that ends well"; //8
Mystring five(alls, 20); //생성자호출
cout << five << "!\n";
Mystring six(alls + 6, alls + 10); //생성자 9
cout << six << ",";
Mystring seven(&five[6], &five[10]); //생성자 10
cout << seven << "...\n";
Mystring eight; //11
cout << "문자열 입력하세요 :";
cin >> eight; // >>연산자호출
cout << " 입력한 문자열은 \"" << eight << "\" 입니다 " << endl;
}
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cs |
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