Plz tell output along with functioning and reasons!!!

Question

#include <iostream>
#include <string>
using namespace std;
class per{
char name[20] ;
float age;
public:
per(char *s,float a)
{
strcpy(name,s);age=a;
}
per & GR(per&x)
{if(x.age>=age) return x;
else
return *this;}
void display()
{cout<<"Name:"<<name<<"\n"; cout<<"Age :"<<age<<"\n";}};
int main() {
per P1("Ramu",27.5),P2("Raju",53),P3("Kalu",40);
per P('\0',0);
P=P1.GR(P3);P.display ();
P=P2.GR(P3);P.display ();}

Answer 1

first add string.h header file
it probably can give error in strcpy function