Filter: Difference between revisions
→{{header|QBASIC}}
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{{works with|Visual Basic for DOS|1.0}}
{{works with|PDS|7.x}}
===Using two arrays===
This version uses two arrays.
<syntaxhighlight lang="qbasic">
' OPTION EXPLICIT
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' Filter
' This program selects certain elements from an array into a new array in a generic way
' Var
' $DYNAMIC
TYPE regSub
aNum AS INTEGER
END TYPE
CONST Even = 2
CONST Uneven = 1
CONST cFile = "DUMMY$$$.$$$"
CONST False = 0, True = NOT False
DIM t AS INTEGER
DIM t2 AS INTEGER
DIM f AS INTEGER
DIM i AS INTEGER
DIM iFlag AS INTEGER
DIM iGetWhat AS INTEGER
DIM iArray%(1 TO 1)
DIM iArray2%(1 TO 1)
DIM rSub AS regSub
' Initialize vars
iFlag = False
f = FREEFILE
iGetWhat = Even
RANDOMIZE TIMER
t = INT(RND * 300) + 1
REDIM iArray%(1 TO t)
' Main program cycle
OPEN cFile FOR OUTPUT AS #f
CLOSE
OPEN cFile FOR RANDOM AS #f LEN = LEN(rSub)
CLS
PRINT "Select items in an array into a new array in a generic way."
PRINT "Base array:"
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iArray%(i) = INT(RND * 2000) + 1
PRINT iArray%(i);
IF (iArray%(i) MOD 2) = 0 AND iGetWhat = Even THEN
iFlag = True
ELSEIF (iArray%(i) MOD 2) <> 0 AND iGetWhat = Uneven THEN
iFlag = True
END IF
IF iFlag THEN
rSub.aNum = iArray%(i)
PUT #f, , rSub
iFlag = False
END IF
NEXT i
'
t2 = LOF(f) / LEN(rSub)
REDIM iArray2%(1 TO t2)
FOR i = 1 TO t2
GET #f, i, rSub
iArray2%(i) = rSub.aNum
NEXT i
CLOSE #f
KILL cFile
PRINT
' Shows the result
IF t2 > 0 THEN
PRINT "Selected items from the array (total:"; t2; "of"; t; "):"
FOR i = 1 TO t2
PRINT iArray2%(i);
NEXT i
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PRINT
PRINT "End of program."
END</syntaxhighlight>
{{out}}
The output can change as the size of the base array and its values varies on each run.
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</pre>
===
Extra points: This version uses one array.
<syntaxhighlight lang="qbasic">
' OPTION EXPLICIT
Line 3,115 ⟶ 3,102:
' This program selects certain elements from an array into a new array in a generic way
' Extra points: Destroys the original values in the array
' Var
' $DYNAMIC
TYPE regSub
aNum AS INTEGER
END TYPE
CONST Even = 2
CONST Uneven = 1
CONST cFile = "DUMMY$$$.$$$"
CONST False = 0, True = NOT False
DIM t AS INTEGER
DIM f AS INTEGER
DIM i AS INTEGER
DIM iFlag AS INTEGER
DIM iGetWhat AS INTEGER
DIM iArray%(1 TO 1)
DIM rSub AS regSub
' Initialize vars
iFlag = False
t = INT(RND * 300) + 1
f = FREEFILE
iGetWhat = Even
REDIM iArray%(1 TO t)
' Main program cycle
OPEN cFile FOR OUTPUT AS #f
CLOSE
OPEN cFile FOR RANDOM AS #f LEN = LEN(rSub)
CLS
RANDOMIZE TIMER
PRINT "Select items in an array into a new array in a generic way."
PRINT "Base array:"
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iArray%(i) = INT(RND * 2000) + 1
PRINT iArray%(i);
IF (iArray%(i) MOD 2) = 0 AND iGetWhat = Even THEN
iFlag = True
ELSEIF (iArray%(i) MOD 2) <> 0 AND iGetWhat = Uneven THEN
iFlag = True
END IF
IF iFlag THEN
rSub.aNum = iArray%(i)
PUT #f, , rSub
iFlag = False
END IF
NEXT i
'
t = LOF(f) / LEN(rSub)
REDIM iArray%(1 TO t)
FOR i = 1 TO t
GET #f, i, rSub
iArray%(i) = rSub.aNum
NEXT i
CLOSE #f
KILL cFile
PRINT
' Shows the result
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