RosettaCodeData/Task/FASTA-format/QBasic/fasta-format.basic

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FUNCTION checkNoSpaces (s$)
FOR i = 1 TO LEN(s$) - 1
IF MID$(s$, i, 1) = CHR$(32) OR MID$(s$, i, 1) = CHR$(9) THEN checkNoSpaces = 0
NEXT i
checkNoSpaces = 1
END FUNCTION
OPEN "input.fasta" FOR INPUT AS #1
first = 1
DO WHILE NOT EOF(1)
LINE INPUT #1, ln$
IF LEFT$(ln$, 1) = ">" THEN
IF NOT first THEN PRINT
PRINT MID$(ln$, 2); ": ";
IF first THEN first = 0
ELSEIF first THEN
PRINT : PRINT "Error : File does not begin with '>'"
EXIT DO
ELSE
IF checkNoSpaces(ln$) THEN
PRINT ln$;
ELSE
PRINT : PRINT "Error : Sequence contains space(s)"
EXIT DO
END IF
END IF
LOOP
CLOSE #1