what does the <> mean in the following GWBASIC programm ?
190 FOR C=2 TO N
200 LET I=C-1
210 WHILE I <> 0
220 IF ASN(I)>ASN(I+1) THEN SWAP ASN(I), ASN(I+1) : I=I-1 ELSE I=0
230 WEND
240 NEXT C
ITS BUBBLE SORT IN GWBASIC