size_t num = 0 这样写对吗？
Is it correct to write size_t num = 0?
我正在编写一个 C 程序，其中我使用 size_t 来存储数值，因为在互联网上它说 size_t 只能存储 unsigned 值。
所以可以在其中存储 0 吗？？
size_t num = 0;
是的，没问题。
C17 6.7.9 (11):
The initializer for a scalar shall be a single expression, optionally enclosed in braces. The initial value
of the object is that of the expression (after conversion); the same type constraints and conversions
as for simple assignment apply, taking the type of the scalar to be the unqualified version of its
declared type.
6.3.1.3 (1) 说：
When a value with integer type is converted to another integer type other than _Bool , if the value
can be represented by the new type, it is unchanged.
0 是 int 类型的表达式，其值为数字零。值零当然可以用 size_t 表示，因此它被初始化为。
如果你更喜欢符号匹配，你可以写size_t num = 0U;，但它的效果是一样的。
我正在编写一个 C 程序，其中我使用 size_t 来存储数值，因为在互联网上它说 size_t 只能存储 unsigned 值。
所以可以在其中存储 0 吗？？
size_t num = 0;
是的，没问题。
C17 6.7.9 (11):
The initializer for a scalar shall be a single expression, optionally enclosed in braces. The initial value of the object is that of the expression (after conversion); the same type constraints and conversions as for simple assignment apply, taking the type of the scalar to be the unqualified version of its declared type.
6.3.1.3 (1) 说：
When a value with integer type is converted to another integer type other than _Bool , if the value can be represented by the new type, it is unchanged.
0 是 int 类型的表达式，其值为数字零。值零当然可以用 size_t 表示，因此它被初始化为。
如果你更喜欢符号匹配，你可以写size_t num = 0U;，但它的效果是一样的。