launch function with signal c 2b 2b

1#include <iostream>
2#include <csignal>
3 
4using namespace std;
5
6sig_atomic_t signalled = 0;
7
8void handler(int sig)
9{
10    signalled = 1;
11}
12
13int main()
14{
15    signal(SIGINT, handler);
16    
17    raise(SIGINT);
18    if (signalled)
19        cout << "Signal is handled";
20    else
21        cout << "Signal is not handled";
22
23    return 0;
24}