I don't know why the leftmost digit of an unsigned integer is 1. Didn't you say that the leftmost number represents positive and negative, 0 is positive and 1 is negative? Why is the first place 1?

I probably remember this. The first bit of binary representation of unsigned number does not represent positive or negative, and the first bit of signed number represents positive or negative.

Unsigned shaping is a positive integer.

Why is floating point data called floating point? The vivid explanation is that the same number can be expressed by scientific counting methods, and there are many ways to express it. The decimal point is floating and represents a real number.