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'These examples use single-line and block IF...THEN...ELSE
'statements to determine how many digits are in a number.
 
'Here is the single-line form:
 
CLS    'Clear screen.
DO
   INPUT "Enter a number greater than 0 and less than 10,000:", X
   IF X >= 0 AND X < 10000 THEN EXIT DO ELSE PRINT X; "out of range"
LOOP
IF X<10 THEN Y=1 ELSE IF X<100 THEN Y=2 ELSE IF X<1000 THEN Y=3 ELSE Y=4
PRINT "The number has"; Y; "digits"
 
 
'Here is the block form, which is easier to read and more powerful:
 
CLS    'Clear screen.
DO
   INPUT "Enter a number greater than 0 and less than 100,000:", X
   IF X >= 0 AND X < 100000 THEN
      EXIT DO
   ELSE
      PRINT X; "out of range"
   END IF
LOOP
 
IF X < 10 THEN
   Y = 1
ELSEIF X < 100 THEN
   Y = 2
ELSEIF X < 1000 THEN
   Y = 3
ELSEIF X < 10000 THEN
   Y = 4
ELSE
   Y = 5
END IF
PRINT "The number has"; Y; "digits"