How to change the alignment of structures in C language

The default in C language is to align the longest data type in the struct with the standard such as

typedef struct _NODE

{

Short A;

int b;

char c;

}node;

will be aligned with int, or 4 bytes, when sizeof (NODE) =12

You can use #pragma pack (n) to change the alignment. The compiler selects the smaller one from "N" and the longest data type length in the struct as the alignment standard

such as #pragma pack (1), relative to the cancellation of alignment, 1B alignment, at this time sizeof (NODE) =7

How to change the alignment of structures in C language