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The All-in-One Guide to C++20

Solution: Compute the Average

Explore how to compute the average of numbers by applying filters for even and greater-than values using C++20 ranges. Understand capturing variables by reference and leveraging views for clean, efficient data processing.

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C++
#include <iostream>
#include <ranges>
#include <vector>
float computeAverage(std::vector<int> numbers, int x) {
    
    auto result = numbers | std::views::filter([](int n){ return n % 2 == 0; })
                          | std::views::filter([&x](int n){ return n > x; });
    
    float average; 
    int size = 0;
    for (auto v: result) {
        average += v;
        size++;
    }
    if (size >0 )return average / size;
    else return 0;
}
int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5, 6};
    std::cout << computeAverage(numbers, 6);
}
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