c - C 中的整数提升会降级 `long int` 吗？

Question

来自C standard

6.3.1.1

If an int can represent all values of the original type (as restricted by the width, for a bit-field), the value is converted to an int; otherwise, it is converted to an unsigned int. These are called the integer promotions.

所以这意味着如果我在表达式中使用 long int，它将被降级为 unsigned int？

Answer 1

您引用的位受其上方文本的限制:

The following may be used in an expression wherever an int or unsigned int may be used:

• An object or expression with an integer type whose integer conversion rank is less than the rank of int and unsigned int.
• A bit-field of type _Bool, int, signed int,or unsigned int.

If an int can represent all values of the original type, the value is converted to an int; otherwise, it is converted to an unsigned int. These are called the integer promotions. All other types are unchanged by the integer promotions.

换句话说，long int 不会被提升为 int 或 unsigned int。