logical or in c++ code example

Example 1: or in cpp

a || b = a or b

Example 2: x += c++

int main ()
{
  int a, b=3;
  a = b;
  a+=2;             // equivalent to a=a+2
  cout << a;
}

Example 3: or c++

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a >= 18 || a == 17){
		cout<<"Sono entrato nel controllo!";
	}
	else{
		cout<<"Controllo Fallito!";
	}
}