#include <iostream>
#include <vector>

using namespace std;

typedef vector<int> AVectorT;

void PrintCompareResult(char op, const vector<int> & a, const vector<int> & b);
void PrintVector(const vector<int> & a);
void TellAboutStringVector(const vector<string> & words);
void CompareTests(const vector<int> & a, const vector<int> & b);

int main() {
     size_t i;
     vector<int> numbers;

     cout << "Numbers is a vector with " << numbers.size() << " elements"
          << endl;

     for(i=0;i<3;i++) {
        numbers.push_back(int(i));
     }

     // values between 0 and numbers.size()-1
     //numbers.at(4) = 9;

     for(i=0;i<numbers.size(); i++) {
        numbers[i] *= 123;
     }

     for(i=0;i<numbers.size(); i++) {
        cout << i << " " << numbers[i] << endl;
     }

     cout << "Numbers is a vector with " << numbers.size() << " elements"
          << endl;

     cout << endl;

     // demonstrate initializer lists.
     vector <int> myNumbers({1,2,3,4,5});
     cout << "myNumbers has " << myNumbers.size() <<" elements" << endl;
     cout << "They are  {" ;

     if (myNumbers.size() > 0) {
         cout << myNumbers[0];
     }

     for(i = 1; i < myNumbers.size(); i++) {
        cout <<", " << myNumbers[i] ;
     }
     cout << "} " << endl;


    // demonstarte uniform initialization
    vector<string>  myStrings = {"hello", "world", "how", "are", "you"};
    TellAboutStringVector(myStrings);

    cout << endl << endl;
    cout << "The for: loop" << endl;

    
    for( auto & x: myStrings) {
        x += " Added";
    }

    for( auto x: myStrings) {
       cout << x << endl;
    }

    for(string aWord:  myStrings) {
       cout << aWord << endl;
    }


    cout << endl << endl;

    vector<int> a = {1,2,3,4};
    vector<int> b = {1,2,3,4};
    vector<int> c = {1,2,4,3};
    CompareTests(a,b);
    CompareTests(a,c);

    return 0;
}

void TellAboutStringVector(const vector<string> & words){
     size_t i;

     cout << "Telling about a string vector " << endl;
     cout << "The vector has " << words.size() << " words." << endl;

     for(i=0; i < words.size(); i++)  {
        cout << "\t" << words[i] << endl;
     }

     return;
}

void PrintVector(const vector<int> & a) {
    size_t i;

    cout << "[";
    bool first = true;

    for(i = 0; i < a.size(); i++) {
       if (first) {
          first = false;
       } else {
          cout << ", ";
       }
       cout << a[i];
    }
    cout <<  "]" ;
}

void PrintCompareResult(string op,const vector<int> & a,const vector<int> & b){
       PrintVector(a);
       cout  << " " << op << " ";
       PrintVector(b);
       cout <<  endl; 

       return;
}


void CompareTests(const vector<int> & a, const vector<int> & b){
    if( a == b) {
       PrintCompareResult("==", a, b);
    }

    if (a != b) {
       PrintCompareResult("!=", a, b);
    }

    if (a < b) {
       PrintCompareResult("<", a, b);
    }

    if (a <= b) {
       PrintCompareResult("<=", a, b);
    }

    if (a > b) {
       PrintCompareResult(">", a, b);
    }

    if (a >= b) {
       PrintCompareResult(">=", a, b);
    }

    return;
}