程序运行时间的计算

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1、程序运行时间的计算ThemethodforcalculatingtherunningtimeoftheprogramIhavetwocollectionstocontributetooneThisisafunctionthatiscommonlyusedinWindowstocomputetherunningtimeoftheprogram;DWORDdwStart=GetTickCount();//runyourprogramcodehereDWORDdwEnd二GetTickCount();Dwend-dwstartisyourprogramruntime,inmillisecondsTh

2、isfunctionisonlyaccurateto55ms,onetickis55ms・#inelude#ineludeUsingnamespaceSTD.Intmain(intargc,char*argv[])DWORDstartandend;Start二GetTickCount();For(int1二0;I<1000;I++)"Youareagoodchild!，z<

3、yGetTickCount(),buttheaccuracyishigherDWORDdwStart二timeGetTime();//runyourprogramcodehereDWORDdwEnd二timeGetTime();Dwend-dwstartisyourprogramruntime,inmillisecondsAlthoughthereturnedvalueunitshouldbems,thelegendisonly10ms・#inelude#include#pragmacomment(lib,^winmm・Lib")Usingnamesp

4、aceSTD.Intmain(intargc,char*argv[]){DWORDstartandend;Start二timeGetTime()For(int1二0;I<100;I++)"Youareagoodchild!，?<

5、standardcfunction.Clock_tclock(void);#includeClock_t二clock();LongSEC二t/CLOCKS_PER_SEC;He'srecordingtheclockcycle,andtheimplementationdoesn，tlookveryprecise,itneedstobetested;4#includeInclude//UsingnamespaceSTD;Intmain(){Time_tbegin,end;Doubleduration;Thebegin二clock()

6、;//here，syourcodeEnd二clock();Duration=double(end一begin)/CLOCKS_PER_SEC;Thecout<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<}5UnixtimeisrelevantandisstandardlibraryThesearein〈time・H〉Thetimegmfunctionsimplyturnsthestructtmstructureintoatime_tstructureanddoesnotusetimezoneinformation.Astructtm(tm);MktimeUS

7、EStimezoneinformationAstructtm(tm);ThetimelocalfunctionistheGNUextensionwiththeposixfunctionmktime(struct)(structtm*tm);Thegmtimefunctionsimplyturnsthetime_tstructureintoastructtmstructureanddoesnotus