ExceptionWhat, C++ (gcc)

ExceptionWhat

//g++  7.4.0
//ExceptionWhat: Demonstration of what() defined in header file exception
//this code is created by Rezaul Hoque on November 16,2021;contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

#include <iostream>
#include <exception>
using namespace std;
class noInvite : public exception {
public:
noInvite(): text("\nYou are not welcome!"){}
~noInvite(){}
const char* what() const noexcept { return text;}

private:
const char* text;
};
class welcome: public exception { 
public:
welcome():t("\nWelcome,you're in the list!"){}
~welcome(){}
const char* what()const noexcept{return t;}
private:
const char* t;
};
void Func(){
int k;
std::cout<<"Enter id:\n";
std::cin>>k;
if (k==0)
throw noInvite();
else
throw welcome();

}
int main()
{
try{
 Func();
}
catch(noInvite no)
{
std::cout<<"Gatecrasher detected!"<<std::endl;
std::cout<<no.what()<<std::endl;
std::cout<<"Sorry, only for invited!"<<std::endl;
}
catch(welcome s)
{
 std::cout<<s.what()<<std::endl;
}
std::cout<<"Thank you!"<<std::endl;
 return 0;
}


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