1// std::max函数：用于返回两个值中的较大值
2#include <iostream>
3#include <algorithm> // std::max
4
5int main() {
6    int a = 10, b = 20;
7    std::cout << "Max: " << std::max(a, b) << std::endl; // 输出20
8    return 0;
9}

1// std::min函数：用于返回两个值中的较小值
2#include <iostream>
3#include <algorithm> // std::min
4
5int main() {
6    int a = 10, b = 20;
7    std::cout << "Min: " << std::min(a, b) << std::endl; // 输出10
8    return 0;
9}

1// std::ceil：向上取整，即返回大于或等于参数的最小整数。
2#include <iostream>
3#include <cmath> // std::ceil
4
5int main() {
6    double value = 3.14;
7    std::cout << "Ceil: " << std::ceil(value) << std::endl; // 输出4
8    return 0;
9}

1// std::floor：向下取整，即返回小于或等于参数的最大整数。
2#include <iostream>
3#include <cmath> // std::floor
4
5int main() {
6    double value = 3.14;
7    std::cout << "Floor: " << std::floor(value) << std::endl; // 输出3
8    return 0;
9}

1// std::round：四舍五入取整。
2#include <iostream>
3#include <cmath> // std::round
4
5int main() {
6    double value = 3.5;
7    std::cout << "Round: " << std::round(value) << std::endl; // 输出4
8    return 0;
9}

1// std::trunc：截断小数部分，即返回数值的整数部分。
2#include <iostream>
3#include <cmath> // std::trunc
4
5int main() {
6    double value = 3.14;
7    std::cout << "Trunc: " << std::trunc(value) << std::endl; // 输出3
8    return 0;
9}

1#include <iostream>
2#include <cmath> // std::abs
3
4int main() {
5    int value = -10;
6    std::cout << "Abs: " << std::abs(value) << std::endl; // 输出10
7    return 0;
8}

1#include <iostream>
2#include <cmath> // std::sqrt
3
4int main() {
5    double value = 16.0;
6    std::cout << "Sqrt: " << std::sqrt(value) << std::endl; // 输出4
7    return 0;
8}

1#include <iostream>
2#include <cmath> // std::pow
3
4int main() {
5    double base = 2.0, exponent = 3.0;
6    std::cout << "Pow: " << std::pow(base, exponent) << std::endl; // 输出8
7    return 0;
8}

1#include <iostream>
2#include <cstdlib> // std::rand, std::srand
3#include <ctime>   // std::time
4
5int main() {
6    std::srand(static_cast<unsigned int>(std::time(nullptr))); // 使用当前时间作为随机数种子
7
8    for (int i = 0; i < 5; i++) {
9        std::cout << "Random number: " << std::rand() << std::endl;
10    }
11
12    return 0;
13}