读ram 数据然后sum

#include<stdio.h>
int main(void)
{
   int sum,b,c,d,e;
   int a = 0x12345678;
   b = (a &0xff) ;
   c = ((a>>8)&0xff);
   d = ((a>>16) &0xff);
   e = ((a>>24) &0xff);
   sum =( b +c +d +e);
   printf("sum = 0x%x,b=0x%x,c=0x%x,d=0x%x,e=0x%x\n",sum ,b,c,d,e);
   printf("\n");
   printf("a= 0x%x\n",a);
   return 0;

}

sum = 0x114,b=0x78,c=0x56,d=0x34,e=0x12

a= 0x12345678