Array Basics

Only local arrays (arrays declared as local variables) are discussed in this document.

• Declaration and initialization:

  int arr[10];
  int arr1[10] = {};
  int arr2[] = {1, 2, 3};
  

  • size must be specified unless it can be inferred from initialization

  • size must be a compilation-time constant

    • int literals: 10
    • pre-defined const variable: const int SIZE = 4

  // ---- correct ----
  const int SIZE = 4;
  int arr3[SIZE];
  
  // ---- wrong ----
  int size = 4;
  int arr4[size];
  

• Access the element:

  int sum = 0;
  int arr[4] = {1, 2, 3, 4};
  cout << "The second element is " << arr[1] << endl;
  arr[1] = 12;
  cout << "Second element is set to " << arr[1] << endl;