       10 // Assignment sample program
       20 //
       30 a:=1
       40 b$:="a"
       50 c$:="abcdefghijklmnopqrstuvwxyz"
       60 DIM d$ OF 1
       70 d$:="xyz"
       80 //
       90 a:+1
      100 a:-1
      110 b$:+"b"
      120 c$(1:4):="ABC"
      130 //
      140 SYS assert, a=1
      150 SYS assert, b$="ab"
      160 SYS assert, c$="ABC efghijklmnopqrstuvwxyz"
      170 SYS assert, d$="x"
      180 PRINT "Ok"
