OOP HomeWork

oop_hw3/hw1/main.cpp

@@ -0,0 +1,74 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <iostream>
+#include <cstring>
+using namespace std;
+class MyString {
+private:
+	char* mpData;
+public:
+	MyString(const char* pData = nullptr) {
+			if (pData == nullptr) {
+				mpData = new char[1];
+				mpData[0] = '\0';
+			}
+			else {
+				int len = strlen(pData);
+				mpData = new char[len + 1];
+				strcpy(mpData, pData);
+		}
+
+	}
+	MyString(const MyString& x) {
+		int len = strlen(x.mpData);
+		mpData = new char[len + 1];
+		strcpy(mpData, x.mpData);
+	}
+	~MyString() {
+		delete[] mpData;
+	}
+	MyString& operator=(const MyString& x) {
+		if (this == &x) return *this;  
+		delete[] mpData;               
+		int len = strlen(x.mpData);
+		mpData = new char[len + 1];   
+		strcpy(mpData, x.mpData);     
+		return *this;                 
+	}
+	MyString& operator+=(const MyString& x) {
+		int len = strlen(mpData) + strlen(x.mpData);
+		char* tmp = new char[len + 1];
+		strcpy(tmp, mpData);         
+		strcat(tmp, x.mpData);       
+		delete[] mpData;             
+		mpData = tmp;                
+		return *this;
+	}
+	friend const MyString operator+(const MyString& x, const MyString& y) {
+		int len = strlen(x.mpData) + strlen(y.mpData);
+		char* tmp = new char[len + 1];
+		strcpy(tmp, x.mpData);
+		strcat(tmp, y.mpData);
+		MyString r(tmp);
+		delete[] tmp;
+ 		return r;
+	}
+	friend ostream& operator<<(ostream& os, const MyString& x) {
+		os << x.mpData;
+		return os;
+	}
+};
+
+int main() {
+	char p[] = "Hello, world!";
+	char q[] = "What are you doing?";
+	char r[] = "How are you!";
+	MyString a(p), b, c;
+	b = MyString(q);
+	c = b;
+	MyString d;
+	d = a + b;
+	cout << d << endl;
+	
+
+	return 0;
+}