明解Ｃ言語 入門編 > 7. 基本型 > 論理和・論理積・排他的論理和 Ruby def count_bits(x) count = 0 while (x != 0) count += 1 if (x & 1 != 0) x = (x >> 1) & ~(~0 << (x.size * 8)) end return count end def int_bits return count_bits(~0) end def pr…