cpp
#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> numbers = {1, 5, 3, 8, 2, 7};
    
    // 优雅的函数式编程风格
    std::ranges::for_each(numbers, [](int n) {
        if (n % 2 == 0) {
            std::cout << n * n << " ";
        }
    });
    
    return 0;
}

rust
fn main() {
    let numbers = vec![1, 5, 3, 8, 2, 7];
    
    // 必须显式处理迭代器和类型
    numbers.iter()
        .filter(|&&n| n % 2 == 0)
        .map(|&n| n * n)
        .for_each(|n| print!("{} ", n));
    

}
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