1 #define NULL 0
2 #include <iostream>
3 #include <string.h>
4 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
5 using namespace std;
6 class String
7 {
8 public:
9 String(){
10 p=NULL;
11 }
12 String(char *str);
13 friend bool operator>(String &string1,String &string2);
14 friend bool operator<(String &string1,String &string2);
15 friend bool operator==(String &string1,String &string2);
16 void display();
17 private:
18 char *p;
19 };
20
21 String::String(char *str)
22 {
23 p=str;
24 }
25
26 void String::display()
27 {
28 cout<<p;
29 }
30
31 bool operator>(String &string1,String &string2)
32 {
33 if(strcmp(string1.p,string2.p)>0)
34 return true;
35 else return false;
36 }
37
38 bool operator<(String &string1,String &string2)
39 {
40 if(strcmp(string1.p,string2.p)<0)
41 return true;
42 else return false;
43 }
44
45 bool operator==(String &string1,String &string2)
46 {
47 if(strcmp(string1.p,string2.p)==0)
48 return true;
49 else return false;
50 }
51
52 void compare(String &string1,String &string2)
53 {
54 if(operator>(string1,string2)==1)
55 {
56 string1.display();
57 cout <<">";
58 string2.display();
59 }else if(operator<(string1,string2)==1)
60 {
61 string1.display();
62 cout <<"<";
63 string2.display();
64 }else if(operator==(string1,string2)==1)
65 {
66 string1.display();
67 cout <<"=";
68 string2.display();
69 }
70 cout<<endl;
71 }
72 int main(int argc, char** argv) {
73 String string1("Hello"),string2("Book"),string3("Computer"),string4("Hello");
74 compare(string1,string2);
75 compare(string2,string3);
76 compare(string1,string4);
77 return 0;
78 }
