C 移位-十进制转十六进制

#include <stdio.h>
#include <string.h>
#include <sys/types.h>          /* See NOTES */
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <linux/ethtool.h>
#include <ctype.h>

void to10_16(int n){
    
    
	int a = n, n1, i;
	char ch[9];
	memset(ch,0,sizeof(ch));

	for(i = 1; i <= 8; i++){
    
    
		n1 = n-((n>>(4*i))<<(4*i));
		n = (n>>(4*i))<<(4*i);
		n1 = n1>>(4*(i-1));

		if(0 == n1)
			break;
		if(n1 < 10)
			ch[8-i] = n1+'0';
		else
			ch[8-i] = n1-10+'A';
	}
	ch[8] = '\0';
	char *p = ch;
	while(0 == *p)
		p++;
	printf("%d(10) is 0x%s(16)\n",a,p);

	unsigned char temp[4];
	memset(temp,0,sizeof(temp));
	memcpy(temp,p,4);
	printf("***");
	for(int j = 0; j < sizeof(temp); j++)
		printf("%02x ",temp[j]);
	printf("end\n");
}


int main(int argc, const char* argv[])
{
    
    
	int k = 25444;

	char kk[4];
	memset(kk,0,sizeof(kk));
	memcpy(kk,&k,4);
	printf("%x to ***",k);
	for(int j = 0; j < 4; j++)
		printf("%x ",kk[j]);
	printf("end\n");
	return 0;


	int a, n, n1, i;
	char ch[9];
	memset(ch, 0, sizeof(ch));
	while(1){
    
    
		scanf("%d",&a);
		getchar();
		to10_16(a);
	}

	return 0;
}