GPT答：

7i24.cn

```c++
bool isIP169_254(const char * ip){
    const char *s = "169.254.";
    if (strlen(ip) >= 8){
        if (strncmp(s, ip, 8) == 0 && strcmp(ip, "0.0.0.0") != 0){
            return true;
        }     
    }
    return false;
}
```

验证：

```c++
int main(){
    const char * ip1 = "169.254.0.8";
    if (isIP169_254(ip1))
        std::cout << ip1 << " is 169.254.x.x" << std::endl;
         
    const char * ip2 = "0.0.0.0" ;
    if (!isIP169_254(ip2))
        std::cout << ip2 << " is not 169.254.x.x" << std::endl;
    
    return 0;
}
```

输出结果：

```
169.254.0.8 is 169.254.x.x
0.0.0.0 is not 169.254.x.x
```