这不是一个"纯粹的"编程问题,但由于它深入参与编程理论,我认为最好在这里问一下.
关于P NP问题,摘自http://en.wikipedia.org/wiki/P_versus_NP_problem:"实质上,问题P = NP?问:假设可以快速验证是或否问题的答案.那么,答案本身也可以快速计算出来吗?"
我想知道,验证答案的速度与生成解决方案的速度有什么关系?
下面的代码预计打印"kevin"但是,它的打印垃圾值.我已经检查了调试器."operator char*"调用返回的指针无效.任何的想法?
class Wrapper
{
private:
char* _data;
public:
Wrapper(const char* input)
{
int length = strlen(input) + 1;
_data = new char[length];
strcpy_s(_data, length, input);
}
~Wrapper()
{
delete[] _data;
}
operator char*()
{
return _data;
}
};
int main()
{
char* username = Wrapper("kevin");
printf(username);
return 0;
}
Run Code Online (Sandbox Code Playgroud) 此代码似乎不适用于横向模式:
Run Code Online (Sandbox Code Playgroud)EditText destinationSearch = (EditText) findViewById(R.id.destinationSearch);destinationSearch.requestFocus(); InputMethodManager imm =(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(destinationSearch,InputMethodManager.SHOW_IMPLICIT);
有没有解决方案在横向模式下显示软键盘?
标题几乎说明了一切,但我会重申这个问题......
以下程序是否符合C99标准的"严格符合程序"?
#include <stdlib.h>
/* Removing any pre-existing macro definition, in case one should exist in the implementation.
* Seems to be allowed under 7.1.3 para 3, as malloc does not begin with _X where X is any capital letter.
* And 7.1.4 para 1 explicitly permits #undef of such macros.
*/
#ifdef malloc
#undef malloc
#endif
/* Macro substitution has no impact on the external name malloc
* which remains accessible, e.g., via "(malloc)(s)". Such use of
* macro …Run Code Online (Sandbox Code Playgroud) 在TextBox输入中.输入密钥后,我想隐藏软键盘.怎么做代码?
private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
if (e.Key != Key.Enter)
return;
...}
Run Code Online (Sandbox Code Playgroud) 我想通过进程名称获取进程的句柄.
我有PID,但当我openProcess用来获取句柄时,它总是返回0或180,我用来使PID正常工作的功能
Handle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ,False,PID);
我该怎么办?