您需要添加强制类型转换，因为您要将常量数据传递给表示我可能会更改"的函数:

You need to add a cast, since you're passing constant data to a function that says "I might change this":

send_str((char *) mystr);  /* cast away the const */

当然，如果函数确实决定更改实际上应该是常量的数据(例如字符串文字)，则会出现未定义的行为.

Of course, if the function does decide to change the data that is in reality supposed to be constant (such as a string literal), you will get undefined behavior.

不过，也许我误会了你.如果send_str()永远不需要更改其输入，但是可能会在调用者的上下文中使用非恒定数据来调用，那么您应该仅使用参数const，因为这只是说不会改变这一点":

Perhaps I mis-understood you, though. If send_str() never needs to change its input, but might get called with data that is non-constant in the caller's context, then you should just make the argument const since that just say "I won't change this":

void send_str(const char *str);

可以安全地使用常量和非常量数据来调用它:

This can safely be called with both constant and non-constant data:

char modifiable[32] = "hello";
const char *constant = "world";

send_str(modifiable);  /* no warning */
send_str(constant);    /* no warning */