content: print Exp(3.1)
  print Log(17.4)
  print Sqr(11.17)
  print Atn(0.5)
  print Cos(3.14 / 4)
  print Sin(3.14 / 2)
  print Tan(3.14 / 4)
  print Abs(-3.5)
  print Cdbl(17)
  print Cint(17.3)
  print Csng(204)
  print Fix(-2.2)
  print Int(7.7)
  print Sgn(33.2)
  print Sgn(-800)
  