十六——十

#include<stdio.h>
union n{
int x;
unsigned char c[4];
} num;
main()
{
int x =20191208;
unsigned char s[4];
unsigned char a[]= {0xe8,0x17,0x34,0x01};
int i;
num.x = x ;
for (i=0;i<4;i++) s[i]=num.c[i];
for (i=0;i<4;i++) printf("%#x ",s[i]);
printf("\n");
for (i=0;i<4;i++) num.c[i]=a[i];
x = num.x;
printf("%d\n",x);
}