判断一个字符串是不是IP地址

#include <stdio.h> int main() {   char str[] = "111.111.111.21";   char str2[] = "a.111.111.111";   char str3[] = "11.1.1.1.d";   printf("%d\n",isIP(str));   printf("%d\n",isIP(str2));   printf("%d\n"

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