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tasks a-s

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Ingy döt Net 2013-04-10 23:57:08 -07:00
parent 47bf37c096
commit b83f433714
12433 changed files with 156208 additions and 123 deletions
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31
Task/Queue-Definition/Tcl/queue-definition-1.tcl Normal file
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proc push {stackvar value} {
upvar 1 $stackvar stack
lappend stack $value
}
proc pop {stackvar} {
upvar 1 $stackvar stack
set value [lindex $stack 0]
set stack [lrange $stack 1 end]
return $value
}
proc size {stackvar} {
upvar 1 $stackvar stack
llength $stack
}
proc empty {stackvar} {
upvar 1 $stackvar stack
expr {[size stack] == 0}
}
proc peek {stackvar} {
upvar 1 $stackvar stack
lindex $stack 0
}
set Q [list]
empty Q ;# ==> 1 (true)
push Q foo
empty Q ;# ==> 0 (false)
push Q bar
peek Q ;# ==> foo
pop Q ;# ==> foo
peek Q ;# ==> bar