32位ipv4转字符串

反正短时间内我这段代码查了2回，写了三回，而且我自己都有实现的

 

struct in_addr ad;
char p[30] = "1.2.3.4";
char q[30];
    
    ad.s_addr = inet_addr(p);
    snprintf(q, 30, "%s", inet_ntoa(ad));