GUI-in-Scilab/C2/Creating-a-GUI-based-Interest-calculator/English

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Title of script: Creating a GUI based Interest calculator

Author: Rashmi Patankar and Iswariya Sasikumar


Visual Cue Narration

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Title Slide

Hello and welcome to the Spoken Tutorial on

“Creating a GUI based Interest calculator”.

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Learning Objectives

In this tutorial, we will:

  • Learn about Radiobuttons and

  • Calculate simple and compound interest using GUI.

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System Requirements

Only Narration

To record this tutorial, I am using

  • Windows 10 OS

  • Scilab 6.1.0 and

  • GUI Builder Toolbox 4.2.1

The process demonstrated in this tutorial is identical in Linux OS also.

Annotations are added to the tutorial if there are any differences.

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Pre-requisites

https://spoken-tutorial.org

To follow this tutorial:

  • The learner must have basic knowledge of Scilab and GUI Builder toolbox.

  • For pre-requisite Scilab tutorials please visit this website.

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Code Files

  • The files used in this tutorial are provided in the Code files link.

  • Please download and extract the files.

  • Make a copy and then use them while practising.

What is a Radiobutton?

  • A Radiobutton is a button with two states.

  • They are intended to be mutually exclusive.

  • As a result, at any given time only one button is in a selected state.

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Objects to calculate simple and compound interest

To calculate the interest, we need three Edit boxes to take user inputs.

  • The first Edit box for principal amount.

  • The second Edit box for rate of interest.

  • The third Edit box for time.

After that, we need two Radiobuttons to calculate Simple and Compound interest.

Lastly, one Text box is required to display the answer.

Cursor on GUIBuilder Palette,

Video-editor: Please put a textbox on screen. “guiFigure.sce”.

Hover over GUIBuilder Palette and Graphic window number 1.

Hover over three Edit boxes and one Text box

I have already opened the guiFigure.sce file using the GUIBuilder toolbox.

The GUIBuilder Palette and Graphic window number 1 open up.

The graphic window shows the GUI with three Edit boxes and one Text box.

Cursor on GUIBuilder Palette,

hover over the first Edit box.

Video-editor: Please put a textbox on screen. “String: Enter principal amount, Tag: ed_principal”

The first Edit box has the String ‘Enter principal amount’ with Tag ‘ed_principal’.

Cursor on GUIBuilder Palette,

hover over the second Edit box.

Video-editor: Please put a textbox on screen. “String: Enter rate of interest, Tag: ed_rate”

The second Edit box has the String ‘Enter rate of interest’ with Tag ‘ed_rate’.

Cursor on GUIBuilder Palette,

hover over the third Edit box. Video-editor: Please put a textbox on screen. “String: Enter time, Tag: ed_time”

The third Edit box has the String ‘Enter time’ with Tag ‘ed_time’.

Cursor on GUIBuilder Palette,

hover over the Text box.

Video-editor: Please put a textbox on screen. “String: UnName4, Tag: txt_answer”

The Text box has the String ‘UnName4’ with Tag ‘txt_answer’.
Now l will add two Radiobuttons for Simple interest and Compound interest.

On GUIBuilder Palette,

click Radiobutton.

Go to GUIBuilder Palette and click on Radiobutton.

On Scilab Multiple Values Request window,

type rd_simple and type Simple interest.

Click on OK.

Let us type rd_simple as the Tag and Simple interest as the String.

Then click on OK.

On Graphic window number 1,

place Radiobutton in the middle left.

Hover cursor over Simple interest Radiobutton.

Let us place this Radiobutton in the middle left of Graphic window number 1.

‘Simple interest’ Radio button appears.

On GUIBuilder Palette,

click Radiobutton.

Let us take another Radiobutton for the Compound interest.

On Scilab Multiple Values Request window,

type rd_compound and type Compound interest.

Click on OK.

Now I will type rd_compound as the Tag and ‘Compound interest’ as the String.

Then click on OK.

On Graphic window number 1,

place Radiobutton in the middle right.

Hover cursor over Radiobutton

Place this Radiobutton next to the Simple interest Radiobutton.

‘Compound interest’ Radiobutton appears.

Now the GUI part is completed.

On GUIBuilder Palette window,

Generate>>Generate GUI code.

Let us save the file.

Go to the GUIBuilder Palette.

Click on Generate and then on the Generate GUI code.

Save as interest-calculator.

Click on Save.

Video-editor: Pls put a textbox on screen. “In Ubuntu Linux OS, click on Ok button.”

I will save this file as interest-calculator.

Click on Save.

On GUI created window,

click on OK.

A pop up opens with a message “GUI created successfully.”

Click on OK.

On SciNotes window,

highlight handles for principal, rate, time, simple interest, compound interest and answer.

You can see that the corresponding Scilab code has been generated.

Notice the handles and properties of the objects we took on a graphic window.

Highlight handles.ed_principal. handles.ed_principal is the handle for principal amount.
Highlight handles.ed_rate. handles.ed_rate is the handle for rate.
Highlight handles.ed_time. handles.ed_time is the handle for time.
Highlight handles.txt_answer. handles.txt_answer is the handle for answer.
Highlight handles.rd_simple. handles.rd_simple is the handle for simple interest.
Highlight handles.rd_compound. handles.rd_compound is the handle for compound interest.

Hover cursor over rd_simple_callback

function.

Now let us write a function definition for rd_simple_callback function.

Cursor on SciNotes window,

type within rd_simple_callback.

handles.rd_simple.value = 1

handles.rd_compound.value = 0

Principal = strtod(handles.ed_principal.string)

Rate = strtod(handles.ed_rate.string)

Time = strtod(handles.ed_time.string)

SI = (Principal * Rate * Time)/100

handles.txt_answer.string = string(SI)

Enter the code as seen here with the same syntax.

The same code can be found under the code files section.

You can use it as explained earlier in this tutorial.

Highlight,

handles.rd_simple.value = 1

handles.rd_compound.value = 0

After clicking the Simple interest Radiobutton-

  • This line will select the Simple interest Radiobutton.

  • The following line will deselect the Compound interest Radiobutton.

This way only one button remains selected.

Highlight,

Principal = strtod(handles.ed_principal.string)

Next line then assigns the user input for principal value to variable ‘Principal’.

Highlight,

Rate = strtod(handles.ed_rate.string)

Its next line assigns the user input for rate of interest to variable ‘Rate’.

Highlight,

Time = strtod(handles.ed_time.string)

The further line assigns the user input for time to the variable ‘Time’.

Highlight,

SI = (Principal * Rate * Time)/100

Notice the next line.

This equation will perform the calculations.

The final result will be stored in the variable ‘SI'.

Highlight,

handles.txt_answer.string = string(SI)

The last line will give the value of the variable ‘SI’ to the Text box.
Hover cursor over rd_compound_callback function. Next I will write a function definition for rd_compound_callback function.

Cursor on SciNotes window,

type within rd_compound_callback.

handles.rd_compound.value = 1

handles.rd_simple.value = 0

Principal = strtod(handles.ed_principal.string)

Rate = strtod(handles.ed_rate.string)

Time = strtod(handles.ed_time.string)

CI = (Principal *(1+( Rate/100))^ Time) - Principal

handles.txt_answer.string = string(CI)

Enter the code as seen here with the same syntax.

The same code can be found under the Code files section.

Highlight,

handles.rd_compound.value = 1

handles.rd_simple.value = 0

This action is similar to what we have seen earlier.

After clicking the Compound interest Radiobutton-

  • The first line will now select the Compound interest Radiobutton.

  • The next line will deselect the Simple interest Radiobutton.

Highlight,

Principal = strtod(handles.ed_principal.string)Rate = strtod(handles.ed_rate.string)

Time = strtod(handles.ed_time.string)

Notice the next three lines are the same as in the rd_simple_callback function.

Highlight,

CI = (Principal *(1+( Rate/100))^ Time) - Principal

The next line will calculate the Compound interest.

The final result will be stored in variable ‘CI'.

Highlight,

handles.txt_answer.string = string(CI)

The last line will give the value of variable ‘CI’ to the Text box.
Press Ctrl+S. Let us save the Scilab code by pressing Ctrl and S keys together.

On Scinotes window,

Execute>>file with echo

Execute this by clicking Execute on the menubar and then on File with echo.

Graphic window number 2 opens.

On Graphic window number 2,

delete Enter the principal amount here.

Type 8000.

Delete Enter rate of interest.

Type 7.

Delete Enter time.

Type 3.

Now let us test the GUI.

Delete the string “Enter principal amount” from the Edit box and type 8000.

Delete the string “Enter rate of interest” from the Edit box and type 7.

Delete the string “Enter time” from the Edit box and type 3.

On Graphic window number 1,

click on Simple interest radiobutton.

Hover cursor over Text box.

Then click on the Simple interest Radiobutton.

The Text box shows the desired answer of 1680 as expected.

On Graphic window number 1,

click on Compound interest radiobutton.

Hover cursor over Text box.

Next click on the Compound interest Radiobutton.

Now the Text box shows the desired answer of 1800.344 as expected.

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Summary

This brings us to the end of this tutorial.  Let us summarise.

In this tutorial, we have:

  • Learnt about Radiobuttons and

  • Calculated simple and compound interest using GUI.

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Assignment

As an assignment, please do the following.

Create a GUI which has

  • An Edit box to take user input in meters.

  • Two Radiobuttons to convert it into inches and feet.

  • One Text box to display the output.

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About Spoken Tutorial Project

The video at the following link summarises the Spoken Tutorial project.

Please download and watch it.

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Spoken Tutorial Workshops

We conduct workshops using Spoken Tutorials and give certificates.

Please contact us.

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Answers for THIS Spoken Tutorial

Please post your timed queries in this forum.
Show Slide: FOSSEE Forum Please post your general and technical queries on Scilab in this forum.

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Textbook Companion project

The FOSSEE team coordinates the TBC project.

For more details, please visit this site.

Show Slide: Lab Migration

The FOSSEE team coordinates the Lab Migration project.

For more details, please visit this site.

Show Slide: Acknowledgement The Spoken Tutorial project is funded by the Ministry of Education, Government of India.
Show Slide: Thank you

This is Iswariya Sasikumar, a FOSSEE intern 2021, IIT Bombay signing off.

Thanks for joining.

Contributors and Content Editors

Iswariyas

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