Access Array Element

Question

Problem: Access Array Element. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 
using namespace std;

// Provides direct access to an array element
int& get_element(int arr[], int index) {
    return arr[index];
}

int main() {
    int arr[10];
    for(int i = 0; i < 10; i++) {
        cin >> arr[i];
    }

    int index, value;
    cin >> index >> value;

    &get_element(arr, index);     // valid only if an lvalue is returned

    get_element(arr, index) = value;

    for(int i = 0; i < 10; i++) {
        cout << arr[i] << (i == 9 ? "" : " ");
    }

    return 0;
}

Explanation & Logic Summary:

get_element returns access to an existing array element
The returned access supports assignment and address-of operations
Updating through the returned access modifies the array directly
No temporary objects or copies are created
The array outlives all uses of the returned access

Firmware Relevance & Real-World Context:

Commonly used in:
- buffer manipulation
- memory-mapped register access
- driver and HAL APIs
Enforces:
- correct lvalue semantics
- safe reference lifetimes
- zero-copy data access
Evaluates:
- lvalue vs rvalue understanding
- API contract deduction
- embedded-safe C++ design

6. Access Array Element