Thread: implementing square root function

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    implementing square root function

    Hi guys, Im facing a serious problem and not finding an optimal way to solve it , I have to implement square root function that gets in its input double x , double toleration and the output must be the value of square root of value x , I musn't use any already built up function like pow or square , I just must use operation / + - *

    the toleration parameter is actually how much error deviation possibility , I mean lets assume toleration is 0.1 , and value x is 10 then 3+0.1 is acceptable and 3-0.1 also acceptable .. toleration is the deviation of your error from the correct value of the square root of x ..

    thanks alot!

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    and the hat of int overfl Salem's Avatar
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Quote Originally Posted by Salem View Post
    didn't understand anything there, wtf it's really complicated ..

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    It is mathematics that I was taught in school when I was 15 years old. Anyway, you don't really need to understand the maths beyond knowing that it is an iterative method that is kind of a sophisticated take on the "guess and check" strategy; just implement the given recurrence relation with an initial guess.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    Quote Originally Posted by laserlight View Post
    It is mathematics that I was taught in school when I was 15 years old. Anyway, you don't really need to understand the maths beyond knowing that it is an iterative method that is kind of a sophisticated take on the "guess and check" strategy; just implement the given recurrence relation with an initial guess.
    I may didn't understand the algorithm itself, it sounds complicated for me but actually from your words it's not, could you explain it for me in brief words? thanks

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    No, work through the Wikipedia example instead. It provides a better explanation of what to implement than I could say "in brief words".
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    Lazy people are like horses! You can lead them to water; but, you can't make them drink.

    Hint: The sample Julia code should help anyone who has the ability to learn to code!

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    and the hat of int overfl Salem's Avatar
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    > didn't understand anything there, wtf it's really complicated
    Try spending more than an hour studying the material before bouncing back with your "feed me" with food already chewed shtick.

    implementing square root function-one-hour-png

    That's being generous.
    Between my post, your notification, your reading and your response, maybe you just looked at it and gave up on the spot.

    You'll never achieve anything worthwhile if this is how quickly you throw in the towel.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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