#include <iostream>

using namespace std;

void PrintArray(int ary[], size_t len, string title);
void MessWith(int ary[], size_t len);
void CantTouchThis(const int ary[], size_t len);

int main() {

    int a[] = {1,2,3,4};
    int b[] = {1,2,2,4};

    // there is not output of arrays
    cout << "Executing: cout << \"The array is \" << a << endl" << endl; 
    cout << "The array is " <<  a << endl;
    cout << endl;

    cout << "Cmparing a and b" << endl;
    if (a == b) {
       cout << "The Same " << endl;
    } else {
       cout << "Different " << endl;
    }

    // no direct comparison
    cout << "The contents are " << endl;
    PrintArray(a, 4,"a");
    PrintArray(b, 4,"b");
    cout << "But the addresses are " << a << " and " << b << endl;
    cout << endl;

    // no assignment.
    // a = b;
    // no input
    // cin >> a;
    

    // pass by reference by default 
    cout << "Before the call " << endl;
    PrintArray(b, 4,"b");
    cout << "Calling MessWith() " << endl;
    MessWith(b,4);
    cout << "After the call " << endl;
    PrintArray(b, 4,"b");
    cout << endl;

/*
    // pass by const reference
    cout << "Before the call " << endl;
    PrintArray(a, 4,"a");
    cout << "Calling MessWith() " << endl;
    MessWith(a,4);
    cout << "After the call " << endl;
    PrintArray(a, 4,"a");
*/

    return 0;
}

void PrintArray(int ary[], size_t len,  string title){
    size_t i;

    cout << title << ":";

    for(i=0; i< len; i++) {
       cout << " " << ary[i];
    }
    cout << endl;

    return;
}

void MessWith(int ary[], size_t len){
    size_t i;

    for(i=0;i<len;i++) {
        ary[i] = -99; 
    }

    return;
}

/*
void CantTouchThis(const int ary[], size_t len) {
    size_t i;

    for(i=0;i<len;i++) {
        ary[i] = -99; 
    }

    return;
}
*/