C 类型提升

前提是小端序，写出输出的值。

int a;
short* b = (short*)&a;
char* c = (char*)&a;
printf("%x %x %x\n", a, *b, *c);

a=0 *b=1
1 1 1

a=0 *b=255
FF FF FFFFFFFF

a=0 *b=256
100 100 0

a=0 *b=-1
FFFF FFFFFFFF FFFFFFFF

a=0 *b=0X1234
1234 1234 34

a=0 *b=-0X1234
EDCC FFFFEDCC FFFFFFCC

a=0x123456FF
123456FF 56FF FFFFFFFF