1、结构方面 (1)a.ifcondition=true thensentence b.ifcondition1= true then sentence1 elseif condition2=true then sentence2 elseif condition3=true then sentence3 else sentence4 end if'if语句块
c.ifcondition1= true then sentence1 else if condition2=true then sentence2 else if condition3=true then sentence3 else sentence4 end if end if end if 'if嵌套 (2)select case select caseexpression caseexp1 sentence1 caseexp2 sentence2 .............
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