下面结构体 struct s1 { char ch, *ptr; union { short a, b; unsigned int c:2, d:1; } struct s1 *next; }; 的大小是_____： 12字节 16字节 20字节 24字节
struct s1 { char ch, *ptr; union { short a, b; unsigned int c:2, d:1; } struct s1 *next; };
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