c++自定义字符串类

最新推荐文章于 2025-07-15 00:06:38 发布

转载最新推荐文章于 2025-07-15 00:06:38 发布 · 2.6k 阅读

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#include <string.h>
#include <stdio.h>
//重载操作符
class String
{
protected:
   char* _data;
   int _size;
public:
   String()
   {
       _data = new char[1];
       _data[0] = 0;
       _size = 0;
   }
   String(const char* str)
   {
       _size = strlen(str);
       _data = new char[_size + 1];
       strcpy(_data, str);
   }
   String(char* data,int length)
   {
       _data = data;
       _size = length;
   }
   String(const String& right)
   {
       _size = right._size;
       _data = new char[_size + 1];
       strcpy(_data, right._data);
   }
   ~String()
   {
       delete[] _data;
       _size = 0;
   }
   void operator=(String& right)
   {
       delete[] _data;
       _size = right._size;
       _data = new char[_size + 1];
       strcpy(_data, right._data);
   }
   void operator+=(const String& right)
   {
       char* pTemp = new char[_size+right._size+1];
       strcpy(pTemp, _data);
       strcpy(pTemp+_size, right._data);
       delete[]_data;
       _data = pTemp;
       _size += right._size;
   }
   void operator+=(const char* str)
   {
       int len = strlen(str);
       char* pTemp = new char[_size + len + 1];
       strcpy(pTemp, _data);
       strcpy(pTemp + _size, str);
       delete[]_data;
       _data = pTemp;
       _size += len;
   }
   void operator+(const char* str)
   {
       int len = strlen(str);
       char* pTemp = new char[_size + len + 1];
       strcpy(pTemp, _data);
       strcpy(pTemp + _size, str);
       delete[]_data;
       _data = pTemp;
       _size += len;
   }
   void operator=(const char* str)
   {
       delete[] _data;
       _size = strlen(str);
       _data = new char[_size + 1];
       strcpy(_data, str);
   }
   String operator+(const String& right)
   {
       char* pData = new char[_size + right._size + 1];
       strcpy(pData, _data);
       strcpy(pData + _size, right._data);
       return String(pData, _size+right._size);
   }
   char& operator[](int index)
   {
       return _data[index];
   }
};

int main(int argc, char *argv[])
{
   String str;
   String str1("aaa");
   String str2 = "aaa";
   String str4 = str2;
   String str5;
   str5=str1;

   str5 += str2;
   char szBuf[10] = "he";
   str5 += szBuf;
   str5 += "test";
   str5 ="aaaaaaaa";
   str5 = str1 + str2;
   char szData[] = "hello world";
   printf("%d", sizeof(szData));

str5[0] = 'c';

getchar();
return 0;
}