Version 2 of Monthly Car Loan Payments and eTCL demo example calculator, numerical analysis

Monthly Car Loan Payments and eTCL demo example calculator, numerical analysis

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

• Monthly Car Loan Payments and eTCL demo example calculator, numerical analysis
• Pseudocode Section
  • Testcases Section
    • Testcase 1
    • Testcase 2
    • Testcase 3
  • Screenshots Section
    • figure 1.
  • References:
• Appendix Code
  • appendix TCL programs and scripts
  • Pushbutton Operation
• Comments Section

gold Here is some eTCL starter code for Monthly Car Loan Payments in calculator shell.

In planning any software, it is advisable to gather a number of testcases to check the results of the program. The results of the testcases are estimated using the hand calculator and then checked in the eTCL slot calculator. Pseudocode and equations are developed from the hand calculations and theory. Small console programs are written to check or proof the alternate subroutines or procedures, rather than keeping the unblessed code and comment lines in the main slot calculator. Finally the improved or alternate subroutines are loaded into the slot calculator. The eTCL slot calculator is effectively a shell program to input entries, host calculation routines, and display results. Additional significant figures are used to check the eTCL calculator, not to infer the accuracy of inputs and product reports.

For the first testcase of sqrt 3, n=2,n*n=4, s=3 was hand calculated in formula.

For the second testcase of sqrt 216000, n=

For the third testcase of

Pseudocode Section

    # using  pseudocode for  procedure algorithm.
            3 quantities needed
            target number
            trial_square_root,   w.a. guess
            formula factor , usually 2 or 3
            check approx. root from square side rule with sqrt function in TCL
     ref. errorx procedure        
     check_answer   new area =? desired goal , desired goal reached (yes/no)
     set answers and printout with resulting values

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

Testcase 2

Testcase 3

Screenshots Section

figure 1.

References:

• Daniel F. Mansfield , N.J. Wildberger.

Appendix Code

appendix TCL programs and scripts

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. The current result 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   |&"  

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Comments Section