int size =5;
    int * arr = new int[size];
    for(int i = 0; i < size; i++){
        arr[i] = rand()%50+10;
    }
    int cap;
    cap = size * 2;
    int *tempArr = new int[size];
    for(int i = 0; i < size;i++){
        tempArr[i] = arr[i];
       // cout << tempArr[i];
    }
    for(int i = size; i < cap; i++){
        tempArr[i] = i;
    }
    delete []arr;
    arr = tempArr;
    cout << endl;
    size = cap;
    for (int i = 0; i < size; i ++){
        cout << tempArr[i] << endl;
    }