Updated 2016-04-24 21:39:20 by gold

Piece wise Profits and eTCL Slot Calculator Demo Example edit

This page is under development. Comments are welcome, but please load any comments in the comments section at the bottom of the page. Please include your wiki MONIKER in your comment with the same courtesy that I will give you. Its very hard to reply intelligibly without some background of the correspondent. Thanks,gold

gold Here is some eTCL starter code for calculating profits from piece wise production and sales, includes flat percentage tax. The impetus for these calculations was calculating profits from antenna sales. Most of the testcases involve modeled data, using assumptions and rules of thumb.

Total costs equal number of units times production cost per unit. Total sales equal number of units times selling price per unit. Total profits equal total sales minus total costs. Total profits equal total profits minus (tax percentage/100.) times total profits.

Pseudocode and Equations

  total costs = number of units * production cost per unit
  total sales = number of units * selling price per unit.
  total profits = total sales - total costs
  total profits = total profits - total profits * (tax percentage/100)
  price? = raw materials + labor  +  profit
  price? = raw materials + heat process
  price? = raw materials + labor 
  average price per unit  = revenue  / units sold

Testcases Section

In planning any software, it is advisable to gather a number of testcases to check the results of the program. The math for the testcases can be checked by pasting statements in the TCL console. Aside from the TCL calculator display, when one presses the report button on the calculator, one will have console show access to the capacity functions (subroutines).

Testcase 1

1 table printed in tcl wiki format
quanity value comment, if any
testcase number 1
selling price per unit: 100.
number of units: 50.
production cost per unit: 65.0
taxes percent % : 0.0
answers: total costs: 5000.0
total sales: 3250.0
total profits dollars : 1750.0

Testcase 2

2table printed in tcl wiki format
quanity value comment, if any
testcase number 2
selling price per unit: 100.
number of units: 50.
production cost per unit: 65.0
taxes percent % : 10.0
answers: total costs: 5000.0
total sales: 3250.0
total profits dollars : 1575.0

Testcase 3

3 table printed in tcl wiki format
quanity value comment, if any
testcase number 3
selling price per unit: 100.
number of units: 50.
production cost per unit: 65.
taxes percent % : 20.
answers: total costs: 5000.0
total sales: 3250.0
total profits dollars : 1400.0


Screenshots Section

figure 1.


References:

  • Profit and Loss formulas [www.sciencehq.com/math-formulas/profit-and-loss-formulas.html]

Appendix Code edit

appendix TCL programs and scripts

        # pretty print from autoindent and ased editor
        # Piece wise profits calculator
        # written on Windows XP on eTCL
        # working under TCL version 8.5.6 and eTCL 1.0.1
        # gold on TCL WIKI , 10apr2014
        package require Tk
        namespace path {::tcl::mathop ::tcl::mathfunc}
        frame .frame -relief flat -bg aquamarine4
        pack .frame -side top -fill y -anchor center
        set names {{} { selling price per unit:} }
        lappend names { number of units:}
        lappend names { production cost per unit: }
        lappend names { taxes percent % : }
        lappend names {answers: total costs dollars:}
        lappend names {total sales dollars:}
        lappend names {profits dollars:}
        foreach i {1 2 3 4 5 6 7} {
    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 Piece Wise Profits             
            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 testcase_number 
            incr testcase_number           
            set selling   $side1  
            set unitsnum  $side2
            set costunits $side3
            set taxepct     $side4
            set side5 [* $side1 $side2 ] 
            set side6 [* $side3 $side2 ]
            set profits [- [* $side1 $side2 ] [* $side3 $side2 ] ]
            set totaltax [* $profits [/ $taxepct 100. ]]
            set profits [- $profits $totaltax]
            set side7 $profits
             }
        proc fillup {aa bb cc dd ee ff gg} {
            .frame.entry1 insert 0 "$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"}
        proc clearx {} {
            foreach i {1 2 3 4 5 6 7} {
                .frame.entry$i delete 0 end } }
        proc reportx {} {
            global side1 side2 side3 side4 side5
            global side6 side7 testcase_number 
            console show;
            puts "%|table printed in| tcl wiki format|% "
            puts "&|quanity| value| comment, if any|& "
            puts "&|testcase number| $testcase_number||& "
            puts "&| selling price per unit:| $side1 ||&"
            puts "&| number of units:| $side2||& "
            puts "&| production cost per unit:| $side3||& "
            puts "&| taxes percent % :| $side4 ||&"
            puts "&| answers: total costs:| $side5||& "
            puts "&| total sales:| $side6 ||&"
            puts "&| total profits dollars :| $side7 ||&"
            }
         frame .buttons -bg aquamarine4
        ::ttk::button .calculator -text "Solve" -command { calculate   }
        ::ttk::button .test2 -text "Testcase1" -command {clearx;fillup 100. 50. 65.0  0.0 5000.0 3250.  1750. }
        ::ttk::button .test3 -text "Testcase2" -command {clearx;fillup 100. 50. 65.0  10.0 5000.0 3250.  1575. }
        ::ttk::button .test4 -text "Testcase3" -command {clearx;fillup 100. 50. 65. 20. 5000. 3250.   1400.0}
        ::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 . "Piece wise profits"       

Pushbutton Operation


For the push buttons, the recommended procedure is push testcase and fill frame, change first three entries etc, push solve, and then push report. Report allows copy and paste from console.

For testcases in a computer session, the eTCL calculator increments a new testcase number internally, eg. TC(1), TC(2) , TC(3) , TC(N). The testcase number is internal to the calculator and will not be printed until the report button is pushed for the current result numbers (which numbers will be cleared on the next solve button.) The command { calculate; reportx } or { calculate ; reportx; clearx } can be added or changed to report automatically. Another wrinkle would be to print out the current text, delimiters, and numbers in a TCL wiki style table as
  puts " %| testcase $testcase_number | value| units |comment |%"
  puts " &| volume| $volume| cubic meters |based on length $side1 and width $side2   |&"  


gold This page is copyrighted under the TCL/TK license terms, this license.

Comments Section edit

Please place any comments here, Thanks.