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#define HEAD 0x1234
int main()
{
unsigned char uc_buff[4];
uc_buff[0] = (HEAD >> 8) & 0xFF;
uc_buff[1] = HEAD & 0xFF;
//or
//uc_buff[0] = (unsigned char)(HEAD >> 8);
//uc_buff[1] = (unsigned char)HEAD;
//...
return 0;
}