windows下面的GetTickCount计时函数

#include <iostream>#include <windows.h>#include <string>using namespace std;DWORD t1;DWORD t2;void timebegin(){t1 = GetTickCount();}void timeend(string str){t2 = GetTickCount();cout << str << " is "<< t2 - t1 << "ms" << endl;}void test(){float a = 1.2633;float b = 1.5;for (int i = 0; i < 10000; ++i){a = a * 1.23696 / 1.02 * 0.95;b = a  * 1.6 / 1.5 * 0.63;}}int main(int argc, char* argv[]){timebegin();for (int i = 0; i < 100; ++i){test();}timeend("time");return 0;}