C++ 程序运行时间

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1.利用C++ 11 新包含的chrono库：

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#include<chrono>
std::chrono::high_resolution_clock::time_point beg, end;
std::chrono::duration<double> time_span;
beg = std::chrono::high_resolution_clock::now();
// do something
end = std::chrono::high_resolution_clock::now();
time_span = std::chrono::duration_cast<std::chrono::duration<double>>(end - beg);
std::cout << "time: " << time_span.count() * 1000 << "ms\n";

2.使用time库：

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#include<ctime>
clock_t beg = clock();
 // do something
std::cout << "time: " << (double)( clock() - beg ) /  CLOCKS_PER_SEC * 1000 << "ms\n";