常数字（constant word) 通常是指固定的描述性数据，但不能作为输入单元。
选择一个，这是非常数字意识，并大声。
此警告意味着将常数字符串用作可能修改该字符串内容的函数的参数。
This warning indicates the use of a constant string as an argument to a function that might modify the contents of that string.
不过，随后则需要考虑正常数字中多出的1位，然后再转换回范围在1到2之间的浮点数。
However, you then need to account for the extra 1-bit in a normalized number, and then convert back to a floating-point number between 1 and 2.
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