现在必须介绍曲率半径的正负号规则。

It is now necessary to introduce a sign convention for radii of curvature.

将运算式的位元向右移，保留正负号。

Shifts the bits of an expression to the right, maintaining sign.

将指定的值转换为8位元带正负号的整数。

Converts a specified value to an 8-bit signed integer.

将指定的值转换为8位元不带正负号的整数。

Converts a specified value to an 8-bit unsigned integer.