Let arr = [1,2,3];

arr[5]=3;

Console.log(arr.length);

#include <iostream>
using namespace std;

int x = 2;

void dob(int) {
    cout << ::x * 2; 
}
int main() {
    int a = 6;
    dob(a);
}

#include<iostream>
using namespace std;

void swap(int a, int b){
    int temp = a;
    a= b;
    b = temp;
}
int main(){
    int a =2 , b = 4;
    cout << a <<" "<< b << endl;
    swap(a,b);
    cout  << a << " " << b << endl;
    return 0;
}