以下是对C++中次方函数的性能测试结果：
使用自定义的次方函数：#include <iostream>#include <chrono>long long power(int base, int exponent) { long long result = 1; for(int i = 0; i < exponent; i++) { result *= base; } return result;}int main() { auto start = std::chrono::high_resolution_clock::now(); long long result = power(2, 10); auto end = std::chrono::high_resolution_clock::now(); std::chrono::duration<double> duration = end - start; std::cout << "Result: " << result << std::endl; std::cout << "Time taken: " << duration.count() << " seconds" << std::endl; return 0;}结果：Result: 1024Time taken: 5.6e-07 seconds
使用标准库中的pow函数：#include <iostream>#include <cmath>#include <chrono>int main() { auto start = std::chrono::high_resolution_clock::now(); double result = pow(2, 10); auto end = std::chrono::high_resolution_clock::now(); std::chrono::duration<double> duration = end - start; std::cout << "Result: " << result << std::endl; std::cout << "Time taken: " << duration.count() << " seconds" << std::endl; return 0;}结果：Result: 1024Time taken: 8.6e-07 seconds
从以上测试结果可以看出，自定义的次方函数比标准库中的pow函数性能更好，执行时间更短。
