[C/C++] memcpy 小记

#include   <stdio.h>
#include   <stdlib.h>
#include   <string.h>
int   main ()
{
    char   a  =  'a' ;
    char   b  =  'b' ;
    char   c  =  'c' ;
    char   d  =  'd' ;
    char   ac [4] = { a ,  b ,  c  ,  d };
    int   i ;
    memcpy (& i ,  ac , 4);
    printf ( "0x%x\n" ,  i );
    int   iNum  = ( a <<24) + ( b <<16) + ( c <<8) +  d ;
    printf ( "iNum: 0x%x\n" ,  iNum );
    getchar ();
}