Question

我需要使用结构访问带符号的短型数字的高位，低位和数字位。对此一无所知，正在浏览互联网，但是关于签名短的信息并不多。

我试图使用某些功能来运行它，但是我的任务是使用位域...

    void print(signed short num)

    {
for (int i = 0; i < 16; i++)
    {
    if (num&(1 << i))
    cout << i << " bit is 1" << endl;
    else
    cout << i << " bit is 0" << endl;

}
cout << "Your number is:" << num << endl;

    }

    int main() {
signed short num;
cout << "Please, enter your number:";
cin >> num;
print(num);
if (num&(1 << 15))
    cout << "Your number is negative" << endl;
else
    cout << "Your number is positive" << endl;

return 0;
    }

Answer 1

您可以结合使用匿名// include the needed localStorage manipulation methods function store(key, data) { localStorage.setItem(key, JSON.stringify(data)); } function retrieve(key) { var data = localStorage.getItem(key); return data ? JSON.parse(data) : null; } function remove(key) { localStorage.removeItem(key); } // create and initialise the button var btn = document.createElement("BUTTON"); btn.onclick = function() {myFunction()}; btn.style.height = "100%"; btn.style.width = "98%"; btn.style.border = "0px"; btn.innerHTML = "CLICK ME"; btn.id = "toggle"; document.getElementById("button").appendChild(btn); var buttonState = retrieve('mybutton'); // make sure at this point element with id="notepad" exists on page if ( null !== buttonState ) { buttonState && document.getElementById('notepad').classList.add('hide'); } function myFunction() { var bt = document.getElementById('notepad'); bt.classList.toggle('hide'); store('mybutton', bt.classList.contains('hide')); return false; }和位域来实现所需的行为：

union

请注意，如果我没记错的话：

union bit_access { int16_t as_short; struct { uint8_t bit15 : 1; // Continue until : uint8_t bit0 : 1; }; }; // You can then access individual bits using : bit_access b = { -1234 }; std::cout << "bit 0 = " << (int) b.bit0 << std::endl;的大小不能保证为16
不保证位域unsigned short不会被填充，您可能需要使用struct之类的东西，它是特定于编译器的。

如何使用位域（结构）重写此代码

1 个答案: