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Task/File-input-output/BASIC/file-input-output-2.basic

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+100 I$ = "INPUT.TXT"
+110 O$ = "OUTPUT.TXT"
+120 D$ = CHR$(4)
+130 M$ = CHR$(13)
+140 PRINT D$"VERIFY"I$
+150 PRINT D$"OPEN"O$M$D$"CLOSE"O$M$D$"DELETE"O$
+160 PRINT D$"OPEN"O$M$D$"OPEN"I$;
+
+170 PRINT M$D$"READ"I$
+180 ONERR GOTO 250
+190 GET C$
+200 POKE 216,0
+210 PRINT M$D$"WRITE"O$",B"B
+220 IF C$ <> M$ THEN PRINT C$;
+230 B = B + 1
+240 GOTO 170
+
+250 POKE 216,0
+260 IF PEEK(222) <> 5 THEN RESUME
+270 PRINT M$D$"CLOSE"I$M$D$"CLOSE"O$