10 OPEN "OUTPUT.TXT" FOR OUTPUT AS 1
15 ON ERROR GOTO 1000
20 A$="One":B$="Two"
30 PRINT#1, A$+B$
40 PRINT#1, -A$
50 PRINT#1, A$+-B$
60 PRINT#1, A$-B$
70 PRINT#1, ABS(A$)
998 CLOSE
999 END
1000 PRINT#1, "error:", ERR, ERL
1010 RESUME NEXT

