c++ raise

#include <iostream>
#include <csignal>
#include <unistd.h>


using namespace std;

void signalHandler(int signum) {
    cout << "interrupt signal (" << signum << ") received.\n";
    exit(signum);
}

int main(){
    int i = 0;
    signal(SIGINT,signalHandler);

    while(++i){
        cout << "going to sleep...." << endl;

        if (i == 3) {
            raise(SIGINT);
        }
        sleep(1);
    }
    return 0;
}