non-helper << operator not working C++ - c++

Question

I'm trying to overload the << operator for the display function call.
Heres my code:
#include <iostream>
#include <cstring>
using namespace std;
// global variable
const int MAX = 3;
// class definition
class CString{
char str[MAX+1];
public:
CString(char* param){
if(param == nullptr){
str[0] = '\0';
return;
}
strncpy(str,param,MAX);
str[MAX] = '\0';
}
void display(ostream& os){
os << str;
}
};
// << operator overloading
ostream& operator << (ostream& os, CString& cs){
static int call = 0;
os << call << ": ";
cs.display(os);
call++;
return os;
}
void process(char* parm){
CString cs(parm);
// here is where my issue is
cs.display(cout);
cout << endl;
}
//----------------------------------------------------------------
int main(int argc,char *argv[]){
cout << "Command Liine : ";
for(int arg = 0; arg < argc ; arg++){
cout << " " << argv[arg];
}
cout << endl;
if( argc == 1){
cout << "Insufffiecentnumber of arguemnts (min1)" << endl;
return 1;
}
cout << " Maxium numver of characters stored: " << MAX << endl;
for(int arg = 1; arg < argc; arg++){
process(argv[arg]);
}
return 0;
}
EDIT:
Here is the correct output and the output I have:
Correct:
Command Line : w1 oop345 btp305
Maximum number of characters stored : 3
0: oop
1: btp
Mine:
Command Line : w1 OOP345 DBS305
Maxium number of characters stored: 3
OOP
DBS
I'm having an issue with my << operator not working, I can't seem to figure it out. The ostream& operator<<(ostream& os, CString& cs) does not seem to be loading its syntax.
Question:
Does anyone know where my mistake has been made?

Answer 1

You wrote a correct overloading of << operator, but in method process() you used a public method display() of class CString instead of using << operator directly.
Just change one line in method process():
cs.display(cout); to: cout << cs;
void process(char* parm){
CString cs(parm);
// here is where my issue is
cout << cs;
cout << endl;
}
P.S. you do not need method CString::display at all as you already overload << operator for this class.