# using pseudocode 
       # possible problem instances,  
      initialize algorithm_result = 1.
      check algorithm 
      f(solution) =? initial product
      check_sum = a+b+c+d+e = original real estate
      set answers and printout with resulting values 
      pseudocode: need test cases > small,medium, giant 
      pseudocode: need testcases within range of expected operation.
      pseudocode: are there any cases too small or large to be solved?

        # pretty print from autoindent and ased editor
        # Combined Availability calculator
        # written on Windows XP on eTCL
        # working under TCL version 8.5.6 and 1.0.1
        # gold on TCL WIKI, 25feb2017
        package require Tk
        package require math::numtheory
        namespace path {::tcl::mathop ::tcl::mathfunc math::numtheory }
        set tcl_precision 17
        frame .frame -relief flat -bg aquamarine4
        pack .frame -side top -fill y -anchor center
        set names {{} { Availability (a) :} }
        lappend names { Use of Availability (a) :}
        lappend names { Availability (b) : }
        lappend names { Use of Availability (b) : }
        lappend names { Availability (c) :}
        lappend names { Use of Availability (c) : }
        lappend names { optional: hours per interval ( usually 24 )}
        lappend names { answers: total hours  :} 
        foreach i {1 2 3 4 5 6 7 8} {
            label .frame.label$i -text [lindex $names $i] -anchor e
            entry .frame.entry$i -width 35 -textvariable side$i
            grid .frame.label$i .frame.entry$i -sticky ew -pady 2 -padx 1 }
        proc about {} {
            set msg "Calculator for Combined Availability 
            from TCL WIKI,
            written on eTCL "
            tk_messageBox -title "About" -message $msg } 
       proc calculate {     } {
            global answer2
            global side1 side2 side3 side4 side5
            global side6 side7 side8 
            global a_hours b_hours c_hours average_hours
            global testcase_number 
            incr testcase_number 
            set side1 [* $side1 1. ]
            set side2 [* $side2 1. ]
            set side3 [* $side3 1. ]
            set side4 [* $side4 1. ]
            set side5 [* $side5 1. ]
            set side6 [* $side6 1. ]
            set side7 [* $side7 1. ]
            set side8 [* $side8 1. ] 
            # initialize placeholder answer
            set total_hours 1.
            set hours_rating 24.
            set hours_rating $side7
            set a_hours [* $hours_rating $side1 $side2 ]
            set b_hours [* $hours_rating $side3 $side4 ]
            set c_hours [* $hours_rating $side5 $side6 ]
            set total_hours [+ $a_hours $b_hours $c_hours ]
            set average_hours [/ [+ $a_hours $b_hours $c_hours ] 3. ]
            set side8 $total_hours
                    }
        proc fillup {aa bb cc dd ee ff gg hh} {
            .frame.entry1 insert 0 "$aa"
            .frame.entry2 insert 0 "$bb"
            .frame.entry3 insert 0 "$cc"
            .frame.entry4 insert 0 "$dd"
            .frame.entry5 insert 0 "$ee"
            .frame.entry6 insert 0 "$ff" 
            .frame.entry7 insert 0 "$gg"
            .frame.entry8 insert 0 "$hh" 
             }
        proc clearx {} {
            foreach i {1 2 3 4 5 6 7 8 } {
                .frame.entry$i delete 0 end } }
        proc reportx {} {
            global side1 side2 side3 side4 side5
            global side6 side7 side8
            global a_hours b_hours c_hours average_hours
            global testcase_number 
            console show;
            puts "%|table $testcase_number|printed in| tcl wiki format|% "
            puts "&| quantity| value| comment, if any|& "
            puts "&| $testcase_number:|testcase_number | |& "
            puts "&| $side1 :|Availability (a)   |   |&"
            puts "&| $side2 :|Use of Availability (a)| |& "  
            puts "&| $side3 :|Availability (b) | |& "
            puts "&| $side4 :|Use of Availability (b)| |&"
            puts "&| $side5 :|Availability (c) | |&"
            puts "&| $side6 :|Use of Availability (c) |  |&"
            puts "&| $side7 :|optional: hours per interval (24,5*8,3*8,55*40, usually 24 )   |  |&"
            puts "&| $a_hours :|hours (a) |  |&" 
            puts "&| $b_hours :|hours (b) |  |&" 
            puts "&| $c_hours :|hours (c) |  |&" 
            puts "&| $average_hours :|average hours per item (a+b+c)/3 |  |&" 
            puts "&| $side8 :|answer: total hours |  |&" 
            }
        frame .buttons -bg aquamarine4
        ::ttk::button .calculator -text "Solve" -command { calculate   }
        ::ttk::button .test2 -text "Testcase1" -command {clearx;fillup 0.8  0.6   0.8 0.7  0.8  0.5 24. 36.4}
        ::ttk::button .test3 -text "Testcase2" -command {clearx;fillup 0.75  0.6  0.7  0.7  0.6  0.7 24. 32.6 }
        ::ttk::button .test4 -text "Testcase3" -command {clearx;fillup 0.8 0.5 0.9 .5  .9  .5 24. 32.2 }
        ::ttk::button .clearallx -text clear -command {clearx }
        ::ttk::button .about -text about -command {about}
        ::ttk::button .cons -text report -command { reportx }
        ::ttk::button .exit -text exit -command {exit}
        pack .calculator  -in .buttons -side top -padx 10 -pady 5
        pack  .clearallx .cons .about .exit .test4 .test3 .test2   -side bottom -in .buttons
        grid .frame .buttons -sticky ns -pady {0 10}
               . configure -background aquamarine4 -highlightcolor brown -relief raised -border 30
        wm title . "Combined Availability Calculator"   

  puts " %| testcase $testcase_number | value| units |comment |%"
  puts " &| volume| $volume| cubic meters |based on length $side1 and width $side2   |&"