查看一个int的所在内存bits

#include <stdio.h>
int main(int argc,char *argv[])
{
    int a,i;
    int b,c,d,e;
    printf("Please input int for a :\n");
    scanf("%d",&a);
    c=a&0x000000ff;
    b=a&0x0000ff00;
    d=a&0x00ff0000;
    e=a&0xff000000;
    b=b>>8;
    d=d>>16;
    e=e>>24;
    printf("\na= 0x%.2X 0x%.2X 0x%.2X 0x%.2X",e,d,b,c);
    printf("\na= ");
    for(i=0;i<32;i++)
        {
        if((a<<i)&0x80000000) printf("1");
        else  printf("0");
        }
    printf("\n");
    printf("\na= 0x%X a=%d",a,a);
    printf("\n");
    return 0;
}