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RealityV15.1Online Documentation (MoTW) Revision 7
WHILE Statement (DataBasic) (m618703+while_s.htm)
Used in conjunction with a FOR or LOOP statement to exit the loop.
WHILE limit-expr {DO}
limit-expr is an expression that evaluates to true or false (1 or 0). It can be similar to the test expression in the IF statement, or a READNEXT or READPREV statement.
Refer to the descriptions of the FOR and LOOP statements.
J=0
LOOP
PRINT J
J=J+1
WHILE J<4 DO REPEAT
Prints sequential values of J from 0 through 3 (loop executes 4 times).
LOOP WHILE READNEXT ID FROM SV SETTING ERROR DO
PRINT ID
REPEAT
Prints all the item-ids in the list SV. Any file error code is assigned to variable ERROR. The program terminates when the list is exhausted.