10 REM create two strings
20 LET s$ = "Hello"
30 LET t$ = "Bob"
40 REM choose any random character
50 LET c = INT(RND*256)
60 REM add the character to the string
70 LET s$ = s$ + CHR$(c)
80 REM check if the string is empty
90 IF s$ = "" THEN PRINT "String is empty"
100 REM compare two strings
110 IF s$ = t$ THEN PRINT "Strings are the same"
120 REM print characters 2 to 4 of a string (a substring)
130 PRINT s$(2 TO 4)