Array Declaration and Initialization

In C++, arrays are a collection of elements of the same type. Here are different ways to declare and initialize arrays:

• Declare an array: To declare an array, you specify the type of elements it will hold and the size of the array. For example:

1int myArray[5];  // Declare an array of size 5

• Declare and initialize an array: You can also declare and initialize an array in a single statement. For example:

1double prices[] = {10.99, 19.99, 7.99};  // Declare and initialize an array

• Declare and initialize an array with a constant size: If you know the size of the array at compile-time, you can use a constant to specify its size. For example:

1const int SIZE = 3;
2string names[SIZE] = {"Alice", "Bob", "Charlie"};  // Declare and initialize an array with a constant size

• Declare and initialize an array of characters: You can declare an array of characters by specifying individual characters enclosed in single quotes. For example:

1char vowels[] = {'a', 'e', 'i', 'o', 'u'};  // Declare and initialize an array of characters

The size of an array can be determined using the sizeof operator. The size of the array is calculated by dividing the size of the entire array by the size of a single element. The following example demonstrates this:

1#include <iostream>
2using namespace std;
3
4int main() {
5  int myArray[5];  // Declare an array of size 5
6
7  double prices[] = {10.99, 19.99, 7.99};  // Declare and initialize an array
8
9  const int SIZE = 3;
10  string names[SIZE] = {"Alice", "Bob", "Charlie"};  // Declare and initialize an array with a constant size
11
12  char vowels[] = {'a', 'e', 'i', 'o', 'u'};  // Declare and initialize an array of characters
13
14  cout << "Size of myArray: " << sizeof(myArray) / sizeof(myArray[0]) << endl;
15  cout << "Size of prices: " << sizeof(prices) / sizeof(prices[0]) << endl;
16  cout << "Size of names: " << sizeof(names) / sizeof(names[0]) << endl;
17  cout << "Size of vowels: " << sizeof(vowels) / sizeof(vowels[0]) << endl;
18
19  return 0;
20}

In this example, we declare different types of arrays and initialize them with values. Then, we use the sizeof operator to determine the size of each array by dividing the size of the entire array by the size of a single element.

Feel free to experiment with different types of arrays and their initialization!

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#include <iostream>

using namespace std;

​

int main() {

  int myArray[5];  // Declare an array of size 5

​

  double prices[] = {10.99, 19.99, 7.99};  // Declare and initialize an array

​

  const int SIZE = 3;

  string names[SIZE] = {"Alice", "Bob", "Charlie"};  // Declare and initialize an array with a constant size

​

  char vowels[] = {'a', 'e', 'i', 'o', 'u'};  // Declare and initialize an array of characters

​

  cout << "Size of myArray: " << sizeof(myArray) / sizeof(myArray[0]) << endl;

  cout << "Size of prices: " << sizeof(prices) / sizeof(prices[0]) << endl;

  cout << "Size of names: " << sizeof(names) / sizeof(names[0]) << endl;

  cout << "Size of vowels: " << sizeof(vowels) / sizeof(vowels[0]) << endl;

​

  return 0;

}