Multiply using Bitwise

This is a discussion on Multiply using Bitwise within the C Programming forums, part of the General Programming Boards category; How to write a program Code: to Perform Multiply of 2 integers using Bitwise Operator ? If u know,Share The ...

  1. #1
    C is Sea. I know a drop! ganesh bala's Avatar
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    Question Multiply using Bitwise

    How to write a program

    Code:
     to Perform Multiply of 2 integers using Bitwise Operator
    ?

    If u know,Share The Logic Plz....

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    C is Sea. I know a drop! ganesh bala's Avatar
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    Share Other than Repeated Addition Logic

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    C++ Witch laserlight's Avatar
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    Search the Web for "bitwise multiplication"? Personally, I will not bother since a * b is likely to be no worse than anything you can implement yourself via bitwise operators. On the other hand, if you are talking about specific cases, then things like a bitwise left shift can come in handy... but an optimising compiler may perform such an optimisation for you anyway.
    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 ganesh bala View Post
    Share Other than Repeated Addition Logic
    You'll be embarrassed if I tell you!

    Think about base 10 (normal number system). If you multiply times the base, it's the same as adding a zero to the right hand side of the number: 12 * 10 = 120.

    That's true with any base numbering system, even binary (base 2).

    We can't add a number to the right, exactly, but we can do the same thing by pulling the current digits of the number...

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