Implement a string class containing the following functions. overloaded + operator function to carry out the concatenation of strings. Overloaded = ( assignment ) operator function to carry out string copy. Function to display the length of a string. Function to overload comparison operator (= = ) for two strings.

Practical 22

#include<iostream.h>
#include<stdio.h>
#include<string.h>
#define MAX 50
class string
{
char str[MAX];
public:

 void operator+=(string s1);
void operator==(string s1);
void operator=(string s1);

string()
{
      strcpy(str,” “);
}
     string(char s[])
{
     strcpy(str,s);
}

};

void string::operator+(string s1)
{
      if(strlen(str)+strlen(s1.str)<MAX)
     {
          strcat(str,s1.str);
         cout<<”\n\nConcatinated string is: “<<str;
     }
    else
   {
     cout<<”\n\nSorry the array size is exceeded.”;
    }
}

void string::operator==(string s1)
{
      if(strcmp(str,s1.str)==0)
             cout<<”\n\nStrings are equal.”;
      else
             cout<<”\n\nStrings are not equal.”;
}

void string::operator=(string s1)
{
      strcpy(str,s1.str);
      cout<<”\n\nCopy of string is: “<<str;
}

int main()
{
string s1,s2;
int choice;
char ans;

do
{
cout<<”\n1.Concatination of string\n2.Equal\n3.Copy string\n;
cout<<”\n\nEnter your choice: “;
cin>>choice;
switch(choice)
{
case 1:
cout<<”\n\nEnter the first string: “;
cin>>s1;
cout<<”\n\nEnter the second string: “;
cin>>s2;
s1+s2;
break;


case 2:
cout<<”\n\nEnter the first string: “;
cin>>s1;
cout<<”\n\nEnter the second string: “;
cin>>s2;
s1==s2;
break;

case 3:
cout<<”\n\nEnter the string: “;
cin>>s1;
s2=s1;
break;

default:
cout<<”\n\nPlease enter correct choice.”;
break;
}
cout<<”\n\n\nDo you want to continue?(y/n): “;
cin>>ans;
}while(ans==’y’ || ans==’Y');

}

output:


1.Concatination of string
2.Equal
3.Copy string
Enter your choice: 1

Enter the first string : karan
Enter the second string : gajjar

concatinated string is  :  karangajjar