小编Sow*_*ran的帖子

#include<stdio.h>
int main()
{
printf("%c\n",~('C'*-1));
return 0;
}

我已经尝试了上述源代码并在没有任何警告的情况下执行。

输出为B。我很兴奋上面的代码是如何处理的以及 printf("%c\n",~('C'*-1))

我正在http://www.raywenderlich.com/78578/android-tutorial-for-beginners-part-3学习宁静的服务

遇到的时候

 AsyncHttpClient client = new AsyncHttpClient();
        client.get(QUERY_URL + urlString,
        new JsonHttpResponseHandler() {

            @Override
public void onSuccess(JSONObject jsonObject) {
// Display a "Toast" message
// to announce your success
Toast.makeText(getApplicationContext(), "Success!",   Toast.LENGTH_LONG).show();

// 8. For now, just log results
Log.d("omg android", jsonObject.toString());
}      
@Override

public void onFailure(int statusCode, Throwable throwable, JSONObject  error) {
// Display a "Toast" message 
// to announce the failure
Toast.makeText(getApplicationContext(), "Error: " + statusCode + " " +    throwable.getMessage(), Toast.LENGTH_LONG).show();

// Log error message …