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I have an variable unsigned int x = 0b0011 how can I make it to unsigned integer array, like y[0]=0 ; y[1]=0; y[2]=1; y[3]=1; ?

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  • Is this an int 0b0011? Commented Feb 7, 2013 at 14:26
  • Do you always know the number of bits in the binary representation or is it arbitrary? Commented Feb 7, 2013 at 14:26
  • Noor: I can define the variable as 'int' if it is necessary. @Jordan Kaye: I just need to output binary values from a GPIO, I need to know the integer value as binaries. So I can say it is not arbitrary Commented Feb 7, 2013 at 14:31

1 Answer 1

Reset to default
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Shifting and bitwise operations.

unsigned x = 0b0011; // yap this is a GNU extension, it doesn't always work even with GCC

const size_t intsize = sizeof(x) * CHAR_BIT; // go go indepency-of-sizeof(int)!

unsigned bits[intsize]; // that's why we love constexprs

int i, j;
for (i = intsize - 1, j = 0; i >= 0; i--, j++) { // and the comma operator too
    bits[j] = (x >> i) & 0x1;
}
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