practical7.cpp

#include<iostream>
#include<stdio.h>
#include<string.h>

using namespace std;

class strtype
{
private:
    char* str;
    int len;

public:
    strtype();
    strtype(char*);
    strtype(strtype&);
    strtype operator+(strtype&);
 //   strtype operator=(strtype&);
    void operator=(char*);
//    void operator=(strtype&, strtype&);
    bool operator>(strtype&);
    bool operator<(strtype&);
    bool operator==(strtype&);
    void display();
    void get();
};

strtype::strtype(strtype& s)
{
    str = new char[s.len+1];
    strcpy(str, s.str);
    len = s.len;
}

strtype::strtype()
{
    str = new char[1];
    strcpy(str, "");
    len = 0;
}

strtype::strtype(char* s)
{
    delete[] str;
    int i;
    for(i=0; s[i]!='\0'; ++i);
    str = new char[i+1];
    len = i;
    strcpy(str, s);
}

void strtype::operator=(char* s)
{
    delete[] str;
    int i;
    for(i=0; s[i]!='\0'; ++i);
    str = new char[i+1];
    len = i;
    strcpy(str, s);
}

bool strtype::operator<(strtype& s)
{
    return(strcmp(this->str, s.str) < 0);
}

bool strtype::operator>(strtype& s)
{
    return(strcmp(this->str, s.str) > 0);
}

bool strtype::operator==(strtype& s)
{
    return(strcmp(this->str, s.str) == 0);
}

strtype strtype::operator+(strtype& s)
{
    char str1[100];
    strcpy(str1, this->str);
    char str2[100];
    strcpy(str2, s.str);
    strcat(str1, str2);
    strtype newString(str1);
    return newString;
}

void strtype::display()
{
    puts(str);
}

void strtype::get()
{
    delete[] str;
    char string2[120];
    gets(string2);
    strtype s(string2);
    str = new char[s.len+1];
    strcpy(str, s.str);
    len = s.len;
}

int main()
{
    strtype first, second, third;
    int choice;
    cout<<"Enter First string: ";
    first.get();
    cout<<"Enter second string: ";
    second.get();
    do{
      cout<<"\nMENU \n1.Enter string 1 \n2.Enter string 2 \n3.Add strings \n4.Compare Strings \n5.Close \nEnter Choice: ";
      cin>>choice;

      if(choice == 1)
      {
        cout<<"Enter First string: ";
        first.get();
      }
      else if(choice == 2)
      {
        cout<<"Enter Second string: ";
        second.get();
      }
      else if(choice == 3)
      {
        third = first + second;
        third.display();
      }
      else if(choice == 4)
      {
        if(first > second) cout<<"First comes first.\n";
        if(first == second) cout<<"Both are equal.\n";
        if(first < second) cout<<"Second won this time.\n";
      }
    }while(choice != 5);
    return 0;
}