RosettaCodeData/Task/Sum-digits-of-an-integer/Applesoft-BASIC/sum-digits-of-an-integer.basic

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10 BASE = 10
20 N$ = "1" : GOSUB 100 : PRINT N
30 N$ = "1234" : GOSUB 100 : PRINT N
40 BASE = 16
50 N$ = "FE" : GOSUB 100 : PRINT N
60 N$ = "F0E" : GOSUB 100 : PRINT N
90 END
100 REM SUM DIGITS OF N$, BASE
110 IF BASE = 1 THEN N = LEN(N$) : RETURN
120 IF BASE < 2 THEN BASE = 10
130 N = 0 : V$ = LEFT$("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ", BASE)
140 FOR I = 1 TO LEN(N$) : C$ = MID$(N$, I, 1)
150 FOR J = 1 TO LEN(V$)
160 IF C$ <> MID$(V$, J, 1) THEN NEXT J : N = SQR(-1) : STOP
170 N = N + J - 1
180 NEXT I
190 RETURN