BigNumber(const unsigned char* bytes, size_t bytes_length, int32_t scale)
: big_number_(BN_new())
, scale_(scale) {
if (bytes && bytes_length > 0) {
// Determine if value is negative and handle two's complement
bool is_negative = ((bytes[0] & 0x80) != 0);
if (is_negative) {
// Create a copy and convert to two's complement
std::vector<unsigned char> twos_complement(bytes_length);
memcpy(&twos_complement[0], bytes, bytes_length);
bool is_carry = true;
for (ssize_t i = bytes_length - 1; i >= 0; --i) {
twos_complement[i] ^= 0xFF;
if (is_carry) {
is_carry = ((++twos_complement[i]) == 0);
}
}
big_number_ = BN_bin2bn(&twos_complement[0], bytes_length, NULL);
BN_set_negative(big_number_.get(), 1);
} else {
big_number_ = BN_bin2bn(bytes, bytes_length, NULL);
BN_set_negative(big_number_.get(), 0);
}
} else {
BIGNUM* bignum = big_number_.get();
BN_zero(bignum);
scale_ = 0;
}
}
int main(int argc, char *argv[]) {
int rc = TRUE;
char in_str[256], out_str[256];
scanf("%s", in_str);
twos_complement(in_str, out_str);
printf("%s\n", out_str);
return rc;
}
/*---------------------------------------------------------------------------------------------
* (function: *create_tree_node_long_long_number)
*-------------------------------------------------------------------------------------------*/
ast_node_t *create_tree_node_long_long_number(long long number, int constant_bit_size, int line_number, int file_number)
{
int flag = 0;
ast_node_t* new_node = create_node_w_type(NUMBERS, line_number, current_parse_file);
new_node->types.number.base = LONG_LONG;
new_node->types.number.value = number;
if (number < 0)
{
flag = 1;
number = number * -1;
}
oassert (ceil((log(number+1))/log(2)) <= constant_bit_size);
new_node->types.number.binary_size = constant_bit_size;
new_node->types.number.binary_string = convert_long_long_to_bit_string(number, new_node->types.number.binary_size);
if (flag == 1)
twos_complement(new_node->types.number.binary_string);
return new_node;
}
int
main() {
std::cout << static_cast<std::bitset<4>>(twos_complement(bits<4>{13})) << '\n';
}
