Fails.
This should compute an approximation of Pi, and here it doesn't, but does in another BASIC just fine: 10 stp = 0.01 20 lo = -2 30 hi = 2 40 sm = 0 50 x = lo 55 fct1 = sqrt(4-x*x) 56 fct2 = x*x*x*cos(0.5*x) 59 fct3 = fct1*(0.5+fct2) 60 sm = sm+fct3 61 REM print sm fct1 fct2 fct3 70 x = x+stp 80 if x <= hi then goto 55 90 sm = sm*stp 100 print sm Here, it complains about illegal character and thelike.