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1、计算机常用函数（Commonlyusedcomputerfunctions）2.3commonlyusedfunctionsFunction:adataoperationorconversionimplementedbyaprogram.1.TheformofsystemfunctionFunctionname(parameterlist)2.ReturnvalueoffunctionTheresultoftheoperationiscalledthereturnvalueofthefunction(onlyone).3.Classifica
2、tionofcommonlyusedfunctionsThecommonlyusedfunctionsaredividedintofivetypes:numericalfunction,characterprocessingfunction,dateandtimefunction,datatypeconversionfunctionandtestfunction.Weshouldnotonlypayattentiontothefunctionnameandfunction,butalsopayattentiontothedatatypeoff
3、unctionindependentvariableandthedatatypeoffunctionvalue,sothateachfunctioncanbeusedcorrectly.Anyfunctionthatcanuseanexpressioncanuseafunction.1.valuedfunction1)absolutevaluefunctionFormat:ABS()Function:findingabsolutevaluesofnumericexpressionsExample:X=
4、-2ABS(x),ABS(10+x),ABS(2+x),ABS(2*x)Answer:28042)signedfunctionFormat:SIGN()Function:asymbolthatreturnsthevalueofanumericexpression,Whenthevalueofthenumericalexpressionispositive,negative,and0,thefunctionsare1,-1,0.Example:X=3Sign(x),sign(-1),sign(x-3)A
5、nswer:1-103)PIfunctionFormat:PI()Function:returns.Example:S=pi()*10*10"S=",sAnswer:s=314.164)findingsquarerootfunctionsFormat:SQRT()Function:returnsthesquarerootofthevalueofthenumericexpression,andthevalueofthenumericexpressioncannotbenegative.Example:X
6、=-4Y=2.22Sqrt(ABS(-4)),sqrt(10+y)Answer:23.505)findingintegerfunctionsFormat:INT()Function:INT()returnstheintegerpartofthenumericexpression.Example:X=3.9Int(x),int(-x)Answer:3-35)findingintegerfunctionsFormat:ceiling()Function:ceili
7、ng()returnsthesmallestintegergreaterthanorequaltoanumericexpression.Example:X=3.9Ceiling(x),ceiling(-x)Answer:4-35)findingintegerfunctionsFormat:floor()Function:floor()returnsthemaximumintegerlessthanorequaltoanumericexpression.Example:X=3.9Floor(x),flo
8、or(-x)Answer:3-46)fourthrowfiveintofunctionFormat:ROUND(,
