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Binary number

rosh72851rosh72851 Posts: 4Member
How do I create a 32 bit binary for a negative integer? Also, if I have an array of integer elements, if some of the elements are like say say 2^15 or (2^5)-1, is there a command that can take the calculated value , or do I have to calculate it seperately?

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  • Josh CodeJosh Code Posts: 675Member
    : How do I create a 32 bit binary for a negative integer? Also, if I
    : have an array of integer elements, if some of the elements are like
    : say say 2^15 or (2^5)-1, is there a command that can take the
    : calculated value , or do I have to calculate it seperately?
    :

    If you want to represent the negative value in binary, the easiest way involves using some bitwise operators.

    [code]
    int x = -5;

    // loop through bits printing out each digit
    for (int bit=31;bit>=0;bit--)
    {
    int val = (x >> bit)&1;
    // shift bits right by value of "bit" and mask down to the 1's digit
    // in matlab, this could be done using: val = bitand(bitshift(x,-bit),1)
    // val is either 0 or 1.
    printf("%d",val);
    // print out the digit as a single '0' or '1'
    // matlab: disp(sprintf("%d",val));
    }

    // output example: 111111111111111111111111111011

    [/code]

    It might be helpful to look at the bitwise operators in MatLab.
    http://matlab.izmiran.ru/help/techdoc/ref/bitshift.html
    http://matlab.izmiran.ru/help/techdoc/ref/bitand.html
  • rosh72851rosh72851 Posts: 4Member
    Oh I didnt think about bitshift. I was trying to use XOR + OR with 1. it didnt work for 32 bits.
    Anyways, what about the second part?

    if I have an array of integer elements, if some of the elements are like say say 2^15 or (2^5)-1, is there a command that can take the calculated value , or do I have to calculate it seperately?
  • rosh72851rosh72851 Posts: 4Member
    Ive tried bitand and bitshift, but it doesnt give me the correct 32 bit binary sequence for a negative integer.

    Ive figure about the second part. But I need help in building binary for negative ints.
    Please reply.
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