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order_byte.c
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order_byte.c
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/*************************************************************************
> File Name: order_byte.c
> Author: laoding
> Mail: dyg1993@foxmail.com
> Created Time: Mon 14 Sep 2015 10:02:45 AM CST
************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#define uint unsigned int
typedef union {
uint num32;
struct union_s{
uint a:4;
uint b:4;
uint c:4;
uint d:4;
uint e:16;
}s_num;
struct union_s1{
uint bit0:1;
uint bit1:1;
uint bit2:1;
uint bit3:1;
/* char half;*/
uint bit4:1;
uint bit5:1;
uint bit6:1;
uint bit7:1;
}b_num;
}TYPE_DEF;
void print_pv(TYPE_DEF tmp);
int isLitteOrder()
{
union tmp_u{
char flag;
uint test_order;
}tmp;
tmp.test_order = 1;
return (tmp.flag == 1)? 1:0;
}
int main(int argc,char **argv)
{
TYPE_DEF tmp;
if(argc < 2)
{
printf("Error Para!\n");
exit(0);
}
tmp.num32 = strtol(argv[1],NULL,0);
if(tmp.num32 > 0xffffffff)
{
printf("Data is too big!(0--0xffffffff)\n");
exit(0);
}
printf("\n0x%x\n",tmp.num32);
if(isLitteOrder())
printf("Litte Order:\n\tlow\t->\t->\tHigh\n");
else
printf("Big Order:\n\thigh\t->\t->\tlow\n");
printf("%d--->%d\n",sizeof(TYPE_DEF),sizeof(tmp));
printf("\ta\tb\tc\td\n");
printf("\t%x\t%x\t%x\t%x\n",tmp.s_num.a,tmp.s_num.b,tmp.s_num.c,tmp.s_num.d);
printf("\n%x\n",tmp.s_num.e);
print_pv(tmp);
return 0;
}
void print_pv(TYPE_DEF tmp)
{
printf("bit0-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit0);
printf("bit1-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit1);
printf("bit2-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit2);
printf("bit3-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit3);
printf("bit4-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit4);
printf("bit5-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit5);
printf("bit6-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit6);
printf("bit7-->%p-->%d\n",&tmp.b_num,tmp.b_num.bit7);
}