C++ Array Size

In C++, you can get the size of an array in several ways. The most common approach depends on whether you’re using a static array (i.e., an array with a fixed size).

Example:

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 20, 30, 40, 50};
    
    // Get the size of the array
    int size = sizeof(arr) / sizeof(arr[0]);

    cout << "The size of the array is: " << size << endl;

    return 0;
}

Explanation:

1. sizeof(arr) gives the total size of the array in bytes, It has 5 element and every integer element has 4 bytes so total bytes = 5*4= 20.
2. sizeof(arr[0]) gives the size of a single element of the array.
3. Dividing sizeof(arr) by sizeof(arr[0]) gives the total number of elements in the array.

Output:

Use Array Size in for loop

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 20, 30, 40, 50};
    
    for(int i=0; i < sizeof(arr) / sizeof(arr[0]); i++) {
        
        cout << "Array element: " << arr[i] << endl;
        
    }
    return 0;
}

Explanation:

1. Array Declaration: int arr[] = {10, 20, 30, 40, 50}; creates an array with 5 elements.
2. Array Size: sizeof(arr) / sizeof(arr[0]) calculates the number of elements in the array instead of direct pass value 5.
3. Looping: A for loop is used to iterate through the array and print each element

Output: