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14.1 if

14.2 case

14.3

17

13

15

if else case switch
while for
15 while for

14.1 if

if if if then
if then else if then else
if then else 17.6
goto

14.1.1 if-then

if

’

’ ’ =’ ’ ’ ’ =’

if else

OpenFile (InputFile,Status)