Article 3: Resize function in std::vector

Article 3: If resize() function is used on std::vector then push_back will insert after the size requested in the function.

Explanation: 

int main()

{

    std::vector<int> data;

    for ( int i = 1; i <= 5; i++)

    {

        data.push_back(i);

    }

    // Here Data : 1,2,3,4,5

    data.resize(10);

    // Here Data : 1,2,3,4,5,0,0,0,0,0

    for ( int i = 11; i <= 15; i++)

    {

        data.push_back(i);

    }

    // Here Data : 1,2,3,4,5,0,0,0,0,0,11,12,13,14,15

}

So whenever resize() function is used the push_back() will do the insertion from the end own-wards.

NOTE: To avoid such situation use [] to insert after resize() function.

e.g.

    for ( int i = 10; i <= 15; i++)

    {

        data[i] =  i;

    }

    // Here Data : 1,2,3,4,5,6,7,8,9,10