How to Iterate Through Consecutive Elements Without Extraneous Separators in C ?

Iterating Consecutive Elements Without Extraneous Separation

In object-oriented programming, it's a common task to perform an operation between consecutive elements of a collection without introducing an unwanted trailing separator. This issue is addressed by iterating through the collection and conditionally printing the separator between elements.

Using C 11's ranged-based for loop, a verbose but effective solution is to iterate through the elements with a second iterator advanced by one:

<code class="cpp">for (auto it = items.cbegin(); it != items.cend(); it++) {
    cout << *it;
    if (std::next(it) != items.cend()) {
        cout << separator;
    }
}</code>

However, this approach adds the overhead of a second iterator and obscures the main logic.

To overcome this aesthetic issue, a simpler approach is to conditionally update a string variable that holds the separator:

<code class="cpp">const auto separator = "WhatYouWantHere";
const auto* sep = "";
for (const auto& item : items) {
    std::cout << sep << item;
    sep = separator;
}</code>

By initializing the sep variable to an empty string and updating it inside the loop, we ensure that the separator is printed between all elements except the last. This provides a concise and efficient solution to the problem.

The above is the detailed content of How to Iterate Through Consecutive Elements Without Extraneous Separators in C ?. For more information, please follow other related articles on the PHP Chinese website!