Program to overload different operators to function with strings

#include<stdio.h> #include<conio.h> #include<iostream.h> class string { char ch[30]; int len; public: void get() { cout<<"Input a string : "; gets(ch); len=0; while(ch[len]!=NULL) { len++; } } string operator +(string str) { string temp_str; temp_str.len=len+str.len; for(int i=0;i<len;i++) { temp_str.ch[i]=ch[i]; } for(int j=0;j<str.len;j++) { temp_str.ch[i++]=str.ch[j]; } temp_str.ch[i]=NULL; return temp_str; } int operator >(string s) { int res=strcmp(*this,s); if(res==1) return 1; else return 0; } int operator <(string s) { int res=strcmp(*this,s); if(res==-1) return 1; else return 0; } int operator ==(string s) { int res=strcmp(*this,s); if(res==0) return 1; else return 0; } int strcmp(string s1,string s2) { int small_len; if(s1.len<s2.len) small_len=s1.len; else small_len=s2.len; for(int i=0;i<small_len;i++) { if(s1.ch[i]>s2.ch[i]) return 1; else if(s1.ch[i]<s2.ch[i]) return -1; } if(s1.len>s2.len) return 1; else if(s1.len<s2.len) return -1; else return 0; } void display() { cout<<"Value of string is : "; puts(ch); cout<<endl<<"Length of string is : "<<len; } }; void main() { clrscr(); string str1,str2,str3; str1.get(); str2.get(); //str3=str1+str2; //str3.display(); if(str1>str2) cout<<"first string is greater"; else if(str1<str2) cout<<"second string is greater"; else cout<<"strings are equal"; getch(); }