RosettaCodeData/Task/Determine-if-a-string-is-numeric/BASIC/determine-if-a-string-is-numeric.basic

10 INPUT "Enter a string";S$:GOSUB 1000
20 IF R THEN PRINT "Is num" ELSE PRINT"Not num"
99 END
1000 T1=VAL(S$):T1$=STR$(T1)
1010 R=T1$=S$ OR T1$=" "+S$
1099 RETURN