Convert integer to binary and store it in an integer array of specified size:c++

Question

I want to convert an integer to binary string and then store each bit of the integer string to an element of a integer array of a given size. I am sure that the input integer's binary expression won't exceed the size of the array specified. How to do this in c++?

Answer 1

Pseudo code:

int value = ????  // assuming a 32 bit int
int i;

for (i = 0; i < 32; ++i) {
    array[i] = (value >> i) & 1;
}

Answer 2

template<class output_iterator>
void convert_number_to_array_of_digits(const unsigned number, 
         output_iterator first, output_iterator last) 
{
    const unsigned number_bits = CHAR_BIT*sizeof(int);
    //extract bits one at a time
    for(unsigned i=0; i<number_bits && first!=last; ++i) {
        const unsigned shift_amount = number_bits-i-1;
        const unsigned this_bit = (number>>shift_amount)&1;
        *first = this_bit;
        ++first;
    }
    //pad the rest with zeros
    while(first != last) {
        *first = 0;
        ++first;
    }
}

int main() {
    int number = 413523152;
    int array[32];
    convert_number_to_array_of_digits(number, std::begin(array), std::end(array));
    for(int i=0; i<32; ++i)
        std::cout << array[i] << ' ';
}

Proof of compilation here