C++学习疑问：for循环迭代调用函数及代码抽象问题

I'm currently working through a C++ course on Udemy, and most of the content has been straightforward and easy to grasp so far. But I've hit a roadblock with two specific areas: understanding the logic of calling a function inside a for-loop, and wrapping my head around the code abstraction steps the tutorial walks through next.

Here's some context to frame my question:

• I’ve written my first custom function (note: I’m using using namespace std;, so I’m working with string instead of std::string).
• I put together a loop to handle a 5-round number guessing game, and that logic makes perfect sense to me. For reference, my initial code looks like this:

#include <iostream>
#include <string>
using namespace std;

string getPlayerGuess() {
    string guess;
    cout << "Enter your guess: ";
    cin >> guess;
    return guess;
}

int main() {
    for (int round = 0; round < 5; round++) {
        string currentGuess = getPlayerGuess();
        // Basic check logic here (e.g., compare to target number)
        cout << "Round " << round + 1 << " guess: " << currentGuess << endl;
    }
    return 0;
}

The confusion started when the tutorial refactored this loop into a separate, abstracted function. I don’t get the why behind this refactoring, or the thought process for structuring the new function correctly. For example, the tutorial’s refactored code looked something like this:

void runGuessGame(int totalRounds) {
    for (int round = 0; round < totalRounds; round++) {
        string currentGuess = getPlayerGuess();
        cout << "Round " << round + 1 << " guess: " << currentGuess << endl;
    }
}

int main() {
    runGuessGame(5);
    return 0;
}

I can see that the loop is now in its own function, but I’m stuck on these specifics:

• When is it actually necessary or beneficial to abstract a loop like this instead of leaving it in main()?
• How do you decide what parameters to pass to the abstracted function (like totalRounds here)?
• Are there best practices for making sure the abstracted function stays focused on one clear task?

It feels like I’m missing the core reasoning behind this refactoring step, and it’s making it hard to keep up with the rest of the course. Any plain-language explanations or practical examples would be really appreciated!

内容的提问来源于stack exchange，提问作者Munerz