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#include <iostream>
#include <cstdlib>
using namespace std;
 
class abs
{
    int a,b;
 
public:
    void unregister(){
        a = 0;
        b = 0;
    }
    void erase(){
        a = 2;
        b = 0;
    }
    abs(int c,int d);
};
abs::abs(int c,int d){
    a = c;
    b = d;
}
int main () {
    abs obj(4, 2);
 
    obj->unregister();
    obj.erase();
}

prog.cpp: In function ‘int main()’:
prog.cpp:25:9: error: expected ‘;’ before ‘obj’
     abs obj(4, 2);
         ^
prog.cpp:25:18: error: statement cannot resolve address of overloaded function
     abs obj(4, 2);
                  ^
prog.cpp:27:5: error: ‘obj’ was not declared in this scope
     obj->unregister();
     ^

Standard output is empty