Array length is the number of elements present in an array. It is often required in programming to iterate over the array or perform other operations based on the size of the array. In C++, we can determine the array length using the `sizeof()` operator or by dividing the total size of the array by the size of one element in the array.
Example 1: Using `sizeof()`
int arr[] = {1, 2, 3, 4, 5};
int len = sizeof(arr)/sizeof(arr[0]); // len = 5
Example 2: Dividing the Total Size
int arr[] = {1, 2, 3, 4, 5};
int size = 5;
int len = sizeof(arr)/size; // len = 5
These code examples belong to the Standard Template Library (STL) package library in C++.
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