設計你自己的字符串類MyString1，并實現下面函數：MyString1()；MyString1(char *chars)；MyString1（char char[], int size）；MyString1 append(MyString1 s);MyString1 append(MyString1 s, int index, int n);MyString1 assign(char chars[]);MyString1 assign(MyString1 s, int index, int n);char at(int index);int length();void clear();MyString1 erase(int index, int n);//刪除當前從index開始的n個字符bool empty();int compare(MyString1 s);請寫出MyString類，然后實現以上函數，謝謝！！
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TA貢獻1765條經驗 獲得超5個贊
//測試程序如下
#include "stdafx.h"
#include <fstream>
#include <iostream>
#include <iterator>
#include <sstream>
#include <cstdlib>
using namespace std;
class Mystring
{
private:
char *a;
int len;
public:
Mystring()
{
len=0;
}
Mystring(char* s)
{
len=strlen(s);
a=new char[len+1];
memcpy(a,s,len+1);
}
void input() //輸入任意長度的字符串
{
char *p = new char[len], ch;
int i = 0;
len = 16;
while(cin>>ch)
{
if(i >= len)
{
char *q = new char[len *= 2];
memcpy(q, p, i);
delete []p;
p = q;
}
p[i++] = ch;
}
len = i;
a = p;
}
void join(const Mystring &s) //在字符串尾部連接上s
{
if(s.len < 1)
return;
int t = s.len + len;
char *q = new char[t]();
memcpy(q, a, len);
memcpy(q+len, s.a, s.len);
a = q;
len = t;
}
~Mystring() //析構函數
{
if(len)
{
delete []a;
a = NULL;
len = 0;
}
}
void Mystring::output()
{
//輸出字符串
if(len==0)
cout<<"該字符串為空！"<<endl;
else
{
for(int i = 0; i < len; i++)
{
cout<<a[i];
}
}
}
int Mystring::length()
{
return len;
}
};
void main()
{
// 類Mystring的測試程序
Mystring s1;
cout<<"字符串s1為：";
s1.output();
cout<<"字符串s1的長度為："<<s1.length()<<endl;
cout<<"請輸入一個字符串：";
s1.input();
cout<<"字符串s1為：";
s1.output();
cout<<"字符串s1的長度為："<<s1.length()<<endl;
Mystring s2("hello!");
cout<<"字符串s2為：";
s2.output();
cout<<"字符串s2的長度為："<<s2.length()<<endl;
s1.join(s2);
cout<<"連接s2后字符串s1為：";
s1.output();
cout<<"字符串s1的長度為："<<s1.length()<<endl;
s2.join(s1);
cout<<"連接s1后字符串s2為：";
s2.output();
cout<<"字符串s2的長度為："<<s2.length()<<endl;
}
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