RosettaCodeData/Task/Reverse-a-string/Commodore-BASIC/reverse-a-string.basic

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100 INPUT "STRING";S$
110 FOR I=1 TO INT(LEN(S$)/2)
120 : J=LEN(S$)+1-I
130 : T$=MID$(S$,I,1)
140 : MID$(S$,I,1) = MID$(S$,J,1)
150 : MID$(S$,J,1) = T$
160 NEXT I
170 PRINT S$