#include <iostream>
#include <string.h>
#include <stdlib.h>
using namespace std;
class myStrcmp
{
public:
//在声明处默认参数
myStrcmp(char *str=NULL);
//析构器
~myStrcmp()
{
cout<<"caibi"<<endl;
delete []str;
}
//运算符重载
int operator > (myStrcmp &str2);
int operator < (myStrcmp &str2);
int operator = (myStrcmp &str2);
private:
char *str; //成员函数str存放字符串
};
//构造器
myStrcmp::myStrcmp(char *str)
{
//如果没有值传进来，字符串置空
if(str==NULL)
{
this->str =new char[1];
*this->str=' ';
}
//如果有值传入，使用strcpy拷贝进对象的str中
else
{
this->str =new char[strlen(str)+1]; //申请空间
strcpy(this->str,str);
}
}
//strcmp运算符重载与自实现
int myStrcmp::operator > (myStrcmp &str2)
{
//字符比较，不等退出
char *p=str2.str; //临时指针变量p，合理调用析构器析构str2
for(;*this->str == *p && *p!= ' ' && *this->str != ' ';(this->str)++,p++);
//比较退出时第一个字符大小
if(*this->str > *p)
return 1;
}
int myStrcmp::operator < (myStrcmp &str2)
{
//字符比较，不等退出
char *p=str2.str; //临时指针变量p
for(;*this->str == *p && *p != ' ' && *this->str != ' ';(this->str)++,p++);
//比较退出时第一个字符大小
if(*this->str < *p)
return -1;
}
int myStrcmp::operator = (myStrcmp &str2)
{
//字符比较，不等退出
char *p=str2.str; //临时指针变量p
for(;*this->str == *p && *p != ' ' && *this->str != ' ';(this->str)++,p++);
//比较退出时第一个字符大小
if((*this->str) == (*p))
return 0;
}
int main()
{
myStrcmp str1("panda"); //字符串s1
myStrcmp str2("panmsa"); //字符串s2
//判断str1与str2大小
if(str1>str2==1)
cout<<"str1>str2"<<endl;
else if(str1<str2==-1)
cout<<"str1<str2"<<endl;
else if((str1=str2)==0)
cout<<"str1=str2"<<endl;
system("pause");
return 0;
}
总结：析构器在析构时，若未定义str2的临时指针变量，str2会析构错误；不要改变指针位置，使用下标进行比较
#include <iostream>
#include <string.h>
#include <stdlib.h>
using namespace std;
class myStrcmp
{
public:
//在声明处默认参数
myStrcmp(char *str=NULL);
//析构器
~myStrcmp()
{
cout<<"caibi"<<endl;
delete []str;
}
//运算符重载
int operator > (myStrcmp &str2);
int operator < (myStrcmp &str2);
int operator = (myStrcmp &str2);
private:
char *str; //成员函数str存放字符串
};
//构造器
myStrcmp::myStrcmp(char *str)
{
//如果没有值传进来，字符串置空
if(str==NULL)
{
this->str =new char[1];
*this->str=' ';
}
//如果有值传入，使用strcpy拷贝进对象的str中
else
{
this->str =new char[strlen(str)+1]; //申请空间
strcpy(this->str,str);
}
}
//strcmp运算符重载与自实现
int myStrcmp::operator > (myStrcmp &str2)
{
//字符比较，不等退出
int i=0;
for(;this->str[i] == str2.str[i] && str2.str[i]!= ' ' && this->str[i] != ' ';i++);
//比较退出时第一个字符大小
if(this->str[i] > str2.str[i])
return 1;
}
int myStrcmp::operator < (myStrcmp &str2)
{
//字符比较，不等退出
int i=0;
for(;this->str[i] == str2.str[i] && str2.str[i]!= ' ' && this->str[i] != ' ';i++);
//比较退出时第一个字符大小
if(this->str[i] < str2.str[i])
return -1;
}
int myStrcmp::operator = (myStrcmp &str2)
{
//字符比较，不等退出
int i=0;
for(;this->str[i] == str2.str[i] && str2.str[i]!= ' ' && this->str[i] != ' ';i++);
//比较退出时第一个字符大小
if((this->str[i]) == (str2.str[i]))
return 0;
}
int main()
{
myStrcmp str1("panda"); //字符串s1
myStrcmp str2("pandaa"); //字符串s2
//判断str1与str2大小
if(str1>str2==1)
cout<<"str1>str2"<<endl;
else if(str1<str2==-1)
cout<<"str1<str2"<<endl;
else if((str1=str2)==0)
cout<<"str1=str2"<<endl;
system("pause");
return 0;
}