公司管理流程图英文版).ppt

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1、Ch5SelectionStatementsProgrammingConstruct1）Wedividethebasicprogrammingconstructintothreetypes:SequentialStructure、SelectionStructureandLoopStructure.2）FlowChart(流程图)：isagraphicalrepresentationinwhichspecificsymbolsandnecessarylettersareusedtodescribethesteps.3）Theflowchartaboutthethreebasicp

2、rogrammingconstructisasfollows：ABconditionABconditionASequentialstructureSelectionStructureSelectionStructure1、relationoperatorandrelationexpression2、logicaloperatorsandlogicalexpression3、ifstatements4、switchstatements5、examplesChapterOutlineThreeforms：（1）if（expression）statements（2）if（express

3、ion）statements1elsestatements2（3）if（expression1）statements1elseif(expression2)statements2elseif(expression3)statements3elseif（expressionm）statementsmelsestatementsnexexex第五章选择结构If语句的形式BriefSummaryForme1：if（expression）statementsexpressionstatementsF(0)T(not0)ex：if(x>y)printf(“%d”,x);Firstly,so

4、lvetheexpression.Ifthevalueoftheexpressionisnotzero，thenthecorrespondingststementsequenceisexcuted.Ifnoneoftheexpressionisfalse,thenexcutethestatementsafterifderectly.第五章选择结构If语句的形式exampleexpressionstatements1statements2TFex：if(x>y)printf(“%d”,x);elseprintf(“%d”,y);Form2：if（expression）stateme

5、nts1elsestatements2第五章选择结构If语句的形式exampleexpression1expression2expression3expression4statements1statements2statements3statements4statements5FFFFTTTTex：if(number>500)cost=0.15;elseif(number>300)cost=0.10;elseif(number>100)cost=0.075;elseif(number>50)cost=0.05;elsecost=0;Form3：nested-ifstatement

6、s第五章选择结构If语句的形式example（1）Theexpressionofthreeformsbehindif-statementsalwaysislogicalorrelationexpression.DCLofthreeif-statementsforms：（2）Inform2andforme3，thereisasemicoloninfrontofelse,alsointheendofallstatements.（3）Behindiforelse,itmayincludeonlyoneoperatestatements,alsoincludemanystatements

7、,butshouldbedrawedtogetherwithbrace.({})第五章选择结构If语句的形式Ex:#includemain(){intx,y;scanf(“%d,%d”,&x,&y);if(x>y)x=y;y=x;elsex++;y++;printf(“%d,%d”,x,y);}CompileError!ex：if(a+ba&&c+a>b){s=0.5*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s-c)