提高C++编程技巧，实现嵌入式系统的数字信号处理功能

#include <iostream>
#include <vector>

int main() {
    // 创建一个存储数字信号数据的vector容器
    std::vector<double> signalData = {1.0, 2.0, 3.0, 4.0, 5.0};

    // 计算信号数据的平均值
    double sum = 0.0;
    for (const auto& data : signalData) {
        sum += data;
    }
    double average = sum / signalData.size();

    std::cout << "Average: " << average << std::endl;

    return 0;
}

#include <iostream>

template<typename T>
T lowPassFilter(const T& input, const T& previousOutput, double alpha) {
    return (alpha * input) + ((1 - alpha) * previousOutput);
}

int main() {
    double input = 10.0; // 输入信号
    double previousOutput = 0.0; // 上一次的输出信号
    double alpha = 0.5; // 滤波器系数

    // 应用低通滤波器
    double output = lowPassFilter(input, previousOutput, alpha);

    std::cout << "Output: " << output << std::endl;

    return 0;
}

#include <iostream>

int main() {
    unsigned int input = 10; // 输入信号

    // 平方计算
    unsigned int squared = input * input;

    std::cout << "Squared: " << squared << std::endl;

    return 0;
}