IP int转字符串

#include <iostream>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>


using namespace std;

int main() {
	        uint32_t ip = 3451909229;
	        char ip_str[16] = {0};
	        int a, b, c, d;
	        a = ip >> 24 & 0xff;
	        printf ("a %d\n", a);
	        b = ip >> 16 & 0xff;
	        printf ("b %d\n", b);
	        c = ip >> 8 & 0xff;
	        printf ("c %d\n", c);
	        d = ip >> 0 & 0xff;
	        printf ("d %d\n", d);
	        sprintf(ip_str, "%d.%d.%d.%d", a, b, c, d);
	        printf(" ip str %s\n", inet_ntoa(ip_addr));
	        sscanf(ip_str, "%d.%d.%d.%d", &a,&b,&c,&d);
	        ip = (a << 24) + (b << 16) + (c << 8) + d;
	       
	        return 0;
}