第四章：运算符的重载的一系列问题（课堂作业）

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#include<istream>using namespace std;#include<string.h>class String{public:String();virtual ~String();String(int n);String(const String &s2);String(const char *str);String & operator = (const String &s1);friend bool operator >(String &string1, String &string2);friend bool operator <(String &string1, String &string2);friend bool operator == (String &string1, String &string2);friend bool operator <= (String &string1, String &string2);friend bool operator >= (String &string1, String &string2);friend ostream& operator << (ostream& , String &);private:char *s;};String::String()//初始化，默认长度为100{s = new char[100];s[0] = '\0';}String::String(int n)//构造一个大小为n的数组{s = new char [n];s[0] = '\0';}String::~String()//析构{if(s){delete s;}s = NULL;}String::String(const String &s2)//拷贝构造函数{    this->s = new char [strlen[s2.s]+1]  ;  //ERROR :C:\Users\Administrator\Desktop\I  can  do  it\fsada.cpp(69) : error C2107: illegal index, indirection not allowed                                      //ERROR: C:\Users\Administrator\Desktop\I  can  do  it\fsad//error //C2440: 'initializing' : //cannot convert from 'char *' to 'int's[0] = '\0';strcpy(s, s2.s);}String::String(const char *str){s = new char[strlen[str]+1];//同上 = =。s[0] = '\0';}String& String :: operator = (const String &s1)//赋值构造函数{if(this == &s1) {return *this;}else{delete   []s1; //ERROR :No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called                       //ERRORE:fatal error C1903: unable to recover from previous error(s); stopping compilation                       s1 = new char [strlen[s1.s]+1];return *this;}}bool operator > (String &string1, String &string2){if(strcmp(string1.s , string2.s) > 0) return true;elsereturn false;}bool operator < (String &string1, String &string2){if(strcmp(string1.s , string2.s) < 0) return true;elsereturn false;}bool operator == (String &string1, String &string2){if(strcmp(string1.s , string2.s) == 0) return true;elsereturn false;}bool operator <= (String &string1, String &string2){if(strcmp(string1.s , string2.s) > 0) return false;elsereturn true;}bool operator >= (String &string1, String &string2){if(strcmp(string1.s , string2.s) < 0) return false;elsereturn true;}ostream& operator << (ostream& output , String & s3){output << s3.s << endl;return output;}
没办法找出错误的原因。无法运行 = =。
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