Calculate program run time in C, Java, and Python

C + +

Http://wenku.baidu.com/view/9e6f4548852458fb770b56c7.html

#include <iostream> #include <time.h>using namespace std;      int main () {clock_t start, finish;      Double totaltime;      start = Clock (); The code snippet that requires test run time is placed in this finish = Clock ();    TotalTime = (double) (Finish-start);      cout<< "spend" <<totalTime<< "milliseconds" <<endl; return 0; }

#include <iostream> #include <windows.h>using namespace std;     int main () {Longlong start, finish;      Longlong TotalTime;      Start = GetTickCount ();      The code snippet that requires a test run time is placed in this finish = GetTickCount ();     TotalTime = Finish-start;      cout<< "spend" <<totalTime<< "milliseconds" <<endl; return 0;}

Java

Pseudo code long Start=system.currenttimemillis ();   Get start time dosomething ();  

nanosecond units

Pseudo code long Start=system.nanotime ();   Get start time dosomething ();  

Python

    From time import clock    start=clock ()    //code    finish=clock ()    print (finish-start)/1000000

Http://www.cnblogs.com/moinmoin/archive/2011/03/18/python-runtime-measuring.html

#-*-Coding:utf-8-*-#!/bin/env pythondef test1 ():    n=0 for    i in range (101):        n+=i    return ndef test2 (): 
   return sum (range (101)) def test3 ():    return sum (x for X in range (101)) if __name__== ' __main__ ': from    Timeit Import Timer    T1=timer ("Test1 ()", "from __main__ import test1")    T2=timer ("Test2 ()", "from __main__ import Test2" )    T3=timer ("Test3 ()", "from __main__ import test3")    print T1.timeit (1000000)    print T2.timeit (1000000) Print    T3.timeit (1000000)    print t1.repeat (3,1000000) print    t2.repeat (3,1000000)    Print T3.repeat (3,1000000)

Calculate program run time in C, Java, and Python