ex2.tcl

很不错的tcl编程实例

# Copyright 1996


# Authors

# Lakshmi Sastry
# Computing and Information Systems Department
# Rutherford Appleton Laboratory, Chilton, Didcot. OX11 0QX
# [e-mail]

#                         and

# Venkat VSS Sastry
# Department of Applied Mathematics and Operational Research
# Cranfield University, RMCS Shrivenham, Swindon, SN6 8LA
# [e-mail]

# Permission to use, copy, modify, and distribute this
# software and its documentation for any purpose and without
# fee is hereby granted, provided that this copyright
# notice appears in all copies.
  
# The authors, RAL, RMCS Shrivenham, Cranfield University and AGOCG
# make no representations about the suitability of this
# software for any purpose.  It is provided "as is" without
# express or implied warranty. Likewise they accept no responsibility
# whatsoever for any public domain software modules used (which are
# hereby acknowledged) in this software 


# Keywords: expr tcl_precision
set tcl_precision 6
set pi6 [expr acos(-1)]   
;# answers are displayed to default value of tcl_precision
puts $tout " pi = $pi6 \n"
set tcl_precision 17
set pi17 [expr acos(-1)]
# display pi to double precision
puts $tout " pi = $pi17 \n"