17 lines
411 B
Tcl
17 lines
411 B
Tcl
proc ifact_caching n {
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global fact_cache
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if { ! [info exists fact_cache]} {
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set fact_cache {1 1}
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}
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if {$n < [llength $fact_cache]} {
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return [lindex $fact_cache $n]
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}
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set i [expr {[llength $fact_cache] - 1}]
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set sum [lindex $fact_cache $i]
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while {$i < $n} {
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incr i
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set sum [expr {$sum * $i}]
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lappend fact_cache $sum
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}
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return $sum
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}
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