Reference Parameter Update

Question

Problem: Reference Parameter Update. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 

// x is passed by reference so changes affect the caller
void update(int& x, int delta) {
    x += delta;
}

int main() {
    int32_t x, delta;
    std::cin >> x >> delta;

    update(x, delta);

    std::cout << x;

    return 0;
}

Explanation & Logic Summary:

Passing x as a reference (int&) allows the function to modify the original variable.
delta is passed by value because it is not modified.
No pointer syntax is required, improving safety and readability.
The updated value of x persists after the function returns.

Firmware Relevance & Real-World Context:

Reference parameters are widely used in embedded APIs to update state or configuration values.
Avoids raw pointer usage while maintaining zero-copy efficiency.
Common in driver interfaces, HAL layers, and middleware code.
Reinforces understanding of data ownership and side effects in firmware functions.

4. Reference Parameter Update