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Arrays in Tcl - a demonstration

# Array in Tcl
 
set town(Wycombe) 120000
set town(Marlow) 32567
set town(Amersham) 17000
set town(Melksham) 24000
set town(1) xxxxxx
set town(1.) yyyyyyy
 
# Note that you CAN use numbers as subscripts but you
# must be careful because element "1" is different to
# element "1." ... or element "1.0"
 
set place Oxford
set town($place) 140000
 
# Note - need to be careful as to whether to put a $ in
# front of the array name, the subscript, both, or neither
# as all rour options are valid in the right circumstance
 
puts "Please choose a town "
set said [gets stdin]
 
if {[info exists town($said)]} {
puts "$said has a population of $town($said)"
} else {
puts "dunno"
}
 
set keylist [lsort [array names town]]
foreach said $keylist {
puts "$said has a population of $town($said)"
}

(written 2007-11-10)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T208 - Tcl/Tk - Arrays and dicts
  [3638] Sorting dicts and arrays in Tcl - (2012-03-04)
  [3614] Tcl - dicts - a tutorial and examples - (2012-02-14)
  [3582] Tcl collections - lists, dicts and array - (2012-01-16)
  [3415] User defined sorting and other uses of callbacks in Tcl and Tk - (2011-09-02)
  [3192] Tcl - Some example of HOW TO in handling data files and formats - (2011-03-04)
  [2466] Tcl - passing arrays and strings in and back out of procs - (2009-10-22)
  [1614] When an array is not an array - (2008-04-17)
  [1405] Sorting in Tcl - lists and arrays - (2007-10-24)
  [1283] Generating traffic for network testing - (2007-07-29)
  [1282] Stringing together Tcl scripts - (2007-07-29)
  [779] The fragility of pancakes - and better structures - (2006-06-26)
  [122] Passing arrays to procs in Tcl - (2004-11-18)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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