软件质量：软件质量：表征、控制和改进-2。

#include <iostream>
// 加法函数
int add(int a, int b) {
    return a + b;
}
// 减法函数
int subtract(int a, int b) {
    return a - b;
}
// 乘法函数
int multiply(int a, int b) {
    return a * b;
}
// 除法函数
float divide(int a, int b) {
    if (b != 0) {
        return static_cast<float>(a) / b;
    } else {
        std::cout << "Error: Division by zero!" << std::endl;
        return 0.0f;
    }
}
int main() {
    int num1, num2;
    std::cout << "Enter two numbers: ";
    std::cin >> num1 >> num2;
    std::cout << "Sum: " << add(num1, num2) << std::endl;
    std::cout << "Difference: " << subtract(num1, num2) << std::endl;
    std::cout << "Product: " << multiply(num1, num2) << std::endl;
    std::cout << "Quotient: " << divide(num1, num2) << std::endl;
    return 0;
}

#include <iostream>
#include <fstream>
#include <string>
void copyFile(const std::string& srcFile, const std::string& destFile) {
    std::ifstream inputFile(srcFile);
    std::ofstream outputFile(destFile);
    if (inputFile.is_open() && outputFile.is_open()) {
        std::string line;
        while (std::getline(inputFile, line)) {
            outputFile << line << std::endl;
        }
        std::cout << "File copied successfully!" << std::endl;
    } else {
        std::cout << "Error: Failed to open file!" << std::endl;
    }
    inputFile.close();
    outputFile.close();
}
int main() {
    std::string sourceFile, destinationFile;
    std::cout << "Enter source file name: ";
    std::cin >> sourceFile;
    std::cout << "Enter destination file name: ";
    std::cin >> destinationFile;
    copyFile(sourceFile, destinationFile);
    return 0;
}

#include <iostream>
#include <string>
bool login(const std::string& username, const std::string& password) {
    std::string validUsername = "admin";
    std::string validPassword = "123456";
    if (username == validUsername && password == validPassword) {
        return true;
    } else {
        return false;
    }
}
int main() {
    std::string username, password;
    std::cout << "Enter username: ";
    std::cin >> username;
    std::cout << "Enter password: ";
    std::cin >> password;
    if (login(username, password)) {
        std::cout << "Login successful!" << std::endl;
    } else {
        std::cout << "Error: Invalid username or password!" << std::endl;
        std::cout << "Please enter valid credentials." << std::endl;
    }
    return 0;
}

#include <iostream>
#include <vector>
#include <algorithm>
void sortNumbers(std::vector<int>& numbers) {
    std::sort(numbers.begin(), numbers.end());
}
int main() {
    std::vector<int> numbers;
    int num;
    std::cout << "Enter numbers (0 to stop): ";
    while (std::cin >> num && num != 0) {
        numbers.push_back(num);
    }
    sortNumbers(numbers);
    std::cout << "Sorted numbers: ";
    for (const auto& number : numbers) {
        std::cout << number << " ";
    }
    std::cout << std::endl;
    return 0;
}

#include <iostream>
#include <vector>
#include <string>
struct Student {
    std::string name;
    int score;
};
void addStudent(std::vector<Student>& students, const std::string& name, int score) {
    students.push_back({name, score});
}
int findScore(const std::vector<Student>& students, const std::string& name) {
    for (const auto& student : students) {
        if (student.name == name) {
            return student.score;
        }
    }
    return -1;
}
float calculateAverageScore(const std::vector<Student>& students) {
    int sum = 0;
    for (const auto& student : students) {
        sum += student.score;
    }
    return static_cast<float>(sum) / students.size();
}
int main() {
    std::vector<Student> students;
    addStudent(students, "Alice", 85);
    addStudent(students, "Bob", 92);
    addStudent(students, "Charlie", 78);
    std::string name;
    std::cout << "Enter student name: ";
    std::cin >> name;
    int score = findScore(students, name);
    if (score != -1) {
        std::cout << "Score: " << score << std::endl;
    } else {
        std::cout << "Student not found!" << std::endl;
    }
    float averageScore = calculateAverageScore(students);
    std::cout << "Average score: " << averageScore << std::endl;
    return 0;
}