C++计时的两种方式

#include< ctime >

using namespace std; clock_t time_start=clock(); //... clock_t time_end=clock(); cout<<"time use:"<<1000*(time_end-time_start)/(double)CLOCKS_PER_SEC<<"ms"<<endl;

#include< chrono >

using namespace std; chrono::steady_clock::time_point time_start=chrono::steady_clock::now(); //.... chrono::steady_clock::time_point time_end=chrono::steady_clock::now(); chrono::duration<double> time_used=chrono::duration_cast<chrono::duration<double>>(time_end-time_start); cout<<"time use:"<<time_used.count()<<"s"<<endl;