Concatenating two strings using overloading

#include <iostream> 
#include <string.h> 
using namespace std; 

class AddString { 
  
public: 
    char s1[25], s2[25]; 
  
    // Parametrized Constructor 
    AddString(char str1[], char str2[]) 
    { 
        // Initialize the string to class object 
        strcpy(this->s1, str1); 
        strcpy(this->s2, str2); 
    } 
  
    // Overload Operator+ to concat the string 
    void operator+() 
    { 
        cout << "\nConcatenation: " << strcat(s1, s2); 
    } 
}; 
  
// Driver Code 
int main() 
{ 
    char str1[25], str2[25];
	cout<<"Enter first string : ";
	gets(str1);
	cout<<"Enter second string : ";
	gets(str2);
  
       AddString a1(str1, str2); 
  
    // Call operator function 
    +a1; 
    return 0; 
}