ARRAY

• ARRAY

  a special type of data that use to collect elements of the same type
• ARRAY

  allow for easy data management, especially when dealing with multiple values
• ARRAY

  each element is accessed using an index

• VARIABLE

  can hold one value

  ex. int a = 12
• ARRAY

  can hold multiple values

  ex: int a[] = {4,5}
• 2 TYPES OF ARRAY

  1. 1D ARRAY
  2. MULTIDIMENSIONAL ARRAY
• ONE DIMENSIONAL ARRAY (1D)

  type of linear array, that access collection of elements in a single index value.
• DECLARATION OF AN ARRAY

  the format of declaring an array is (data type array-name[size]

  A) format

  
• data type array-name[size]

  how to declare an array?
• accessing the element of an array

  cout << num[index];
• choose the correct output

  The array elements are: 5 7 9 1 0 100 200 300

  
• Traversing

  is Iterating through an array using a loop.

  for (int i = 0; i < 5; i++) { cout << arr[i]; }
• Updating

  Changing an existing element’s value.

  arr[1] = 100;
• Appending

  Adding an element to the end (only for vector).

  vector<int> v = {1, 2}; v.push_back(3);
• Inserting

  Adding an element at a specific position (for vector).

  v.insert(v.begin() + 1, 50);
• Deleting

  Removing an element by shifting elements (array) or using erase() (vector).

  
  

  v.erase(v.begin() + 1);
• Searching

  Finding an element using find() function.

  auto it = find(v.begin(), v.end(), 3);
• Sorting

  Arranging elements in ascending/descending order.

  sort(arr, arr + 5);
• Size

  Getting the number of elements in a vector.

  cout << v.size();
• Resizing

  Changing the size of a vector dynamically.

  v.resize(10);
• Clearing

  Removing all elements from a vector.

  v.clear();
• vector

  automatically resize, dynamic array. standard template library.

  #include vector.
• v.push_back;

  add an element at the very end
• Multidimensional Array

  An array with multiple dimensions.

  
  

  int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};
• Pointer Arrays

  Storing an array dynamically using pointers.

  int* ptr = new int[5]; delete[] ptr;
• Dynamic Allocation

  Allocating memory at runtime.

  int* arr = new int[10]; delete[] arr;
• Copying Arrays

  Copying elements from one array to another.

  copy(begin(arr1), end(arr1), begin(arr2));
• TWO DIMENSIONAL ARRAY (2D)

  • collection of a fixed no. of components (of the same type) arranged in two dimensions
• DECLARATION SYNTAX


  nested because there’s 2 position needed (row, and columns) para hindi malito and ma-define or ma-specify maigi yung rows and column
• TWO DIMENSIONAL ARRAY

  sometimes called matrices or tables