指针的注意用法(持续中)

注意一：

char *buff = (char*)malloc(256);

ps:sizeof(buff) = 4;//32位系统

char *buff = "asd";

ps:sizeof(buff) = 4;//32位系统

char buff[256] = {0};

ps:sizeof(buff) = 256;//理解——buff的类型是char[256]