Thread: Copy float value to memory block

  1. #1
    Registered User
    Join Date
    May 2010

    Copy float value to memory block

    I want to copy a float value to an allocated block of memory, with an offset from the memory block pointer.

    void Bank::PokeFloat(const int& pos, const float& n)
    	if (pos<0) return;
    	if (pos+4>size) return;
    How do I do this?
    Last edited by JMK; 09-18-2010 at 12:04 PM.

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Pretty much like what you did.

    Now assuming you tried it, what were your observations and error messages?
    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.

  3. #3
    Join Date
    Oct 2007
    Inside my computer
    Why do you want to do it?
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  4. #4
    Algorithm Dissector iMalc's Avatar
    Join Date
    Dec 2005
    New Zealand
    1. For built-in types not greater than the size of a pointer, passing by value is at least as efficient as passing by const reference.

    2. Don't use just 4. Use sizeof(float), for readability sake, if nothing else.
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