Share My Creation 7Calc

Discussion in 'Share Your Creations' started by JLS, May 1, 2015.

  1. JLS

    JLS Member Licensed User

    Hello everybody

    This is my very first creation for Android. 7Calc is a calculator but also a currency converter and a measurement unit converter.

    You can set it up in Spanish and English (so far).

    Well, I know it's not the most original idea, but I thougth it was a good Project as a beginning.

    I would like to thank Erel and all the people who share their knowloedge to help people like me.

    You can download 7Cal from

    Feedback welcome.
  2. Beja

    Beja Expert Licensed User

    Hi JLS and thanks for sharing this..
    I like the quick percentage calculation..

    1- How do you update the currency exchange rate?
    2- How does the send and receive function work?
  3. sorex

    sorex Expert Licensed User

    @JLS : looks great.

    just wondering why you named it 7Calc and not 8Calc, 4Calc or something like it ?
    JLS likes this.
  4. JLS

    JLS Member Licensed User

    Hi Beja. I'm glad you like it.

    1- The updated rates are downloaded from My function is inspired in a tutorial post in this site. You can find it in

    2- If you refer to updating rates you can find the method in the tutorial. Anyway, I'll be happy to give you any further information.
  5. JLS

    JLS Member Licensed User

    Thank you for your comment. :-D

    Why 7Calc? Well. Seven is one of my favourite numbers and the App is a calculator, so...

    Besides, my commercial name is "111 Soft" Can you figure out why?
  6. sorex

    sorex Expert Licensed User

    because that's the binary representation of 7.

    it's always interesting to know the idea behind app or business names :)
  7. JLS

    JLS Member Licensed User

  8. Roger Daley

    Roger Daley Well-Known Member Licensed User


    Very impressive. Great UI and great functionality.
    A couple of things:
    1. I couldn't find the converters. You need a Help file.
    2. The square of the square root of 2 gives a result of1.99999. You may be using Float when it is better to use Double Precision and then round to 15 decimal places. Use Numberformat, not the Round function.
    3.For big numbers consider using scientific notation.

  9. JLS

    JLS Member Licensed User

    Thank you for your feedback, Roger.

    1. I absolutely agree. I´m already working on it.

    2. This is a wanted effect. I hesitated a lot with it. Let me explain:

    In other calculators, if you calculate 2 square root (result is 1,4142135624) and then square the result is 2.
    BUT if you type 1,4142135624 and then square the result is 2,0000000001.

    That's why in my App the result is the same than if you type the number.

    As I said, I'm not sure (I'm still hesitating) if my point of view is better or worse. As I see, probably worse (I have a complaint about this in Google Play too). Anyway, recoding will be really easy.

    3. I agree too. Probably, it will be an option in the next update.

    Thanks again.
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