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The process of implementing functionality in C/C++ depends on the specific task, but the general approach includes the following steps:

1. Requirements analysis: Understanding what exactly needs to be implemented.

2. Design: Defining the program structure, choosing appropriate data structures and algorithms.

3. Coding: Writing code using C/C++ features, such as functions, classes, pointers, standard library.

4. Testing: Checking the correctness of the implemented functionality.

Example of a simple implementation of a function to sum array elements:

#include <iostream>

int sumArray(const int* arr, int size) {
    int sum = 0;
    for (int i = 0; i < size; ++i) {
        sum += arr[i];
    }
    return sum;
}

int main() {
    int data[] = {1, 2, 3, 4, 5};
    std::cout << "Sum: " << sumArray(data, 5) << std::endl;
    return 0;
}

This approach can be adapted to any task by adding necessary structures and logic.