[Ubuntu] 切換權限 root

-
先更改密碼，在切換使用者帳號至root
  • sudo passwd root
  • sudo su -

留言

張貼留言

這個網誌中的熱門文章

[Qt, C++] Qt Timer 用法

-
#include <QtWidgets/QmainWIndow> #include <QObject> #include <QDebug> #include <QtCore> #include <QThread> class A : public QObject {     Q_OBJECT public:     GUI *gui; public slots:     void GetTest1(); signals:     void test1(); } void GetTest1() { std::cout << "test1" << std::endl; Sleep(10); } A *testA; QThread *threadA; int main() { testA = new A(); testA->moveToThread(threadA); threadA->start(); Qtimer *timer = new Qtimer(this); connect(timer, SIGNAL(timeout()), testA, SLOT(GetTest1())); timer->start(1000); }
閱讀完整內容

[C++] LeeCode 7. Reverse Integer

-
Language Information : C++ Description : Reverse Integer URL :  https://leetcode.com/problems/reverse-integer/ Code : class Solution { public: int reverse(long long int x) { long long int sum = 0; long long int num = abs(x); vector<int> vec; while(num>0){ long long int temp = num%10; vec.push_back(temp); num = num/10; } for(int i=0;i<vec.size();i++){ sum += vec[i]*pow(10,vec.size()-i-1); } if(x<0){ sum = 0-sum; } if(sum < INT_MIN || sum > INT_MAX){ return 0; }else{ return (int)sum; } } }; - 使用迴圈去%10並存入vector， 在使用迴圈反過來乘上十的N次方， 要注意負數， 再來要注意到此題要求最終答案小於int的範圍要回傳0。
閱讀完整內容