Why does issuing empty asm commands swap variables?

So I was messing around with inline assembly and compiled this using GCC 9. The result was that the two variables a and b were swapped without actually issuing any direct commands. #include<cstdio> int main(){ int a(1),b(2),c(3); asm (“”: “=r”(c):”r”(a)); asm (“”: “=r”(a):”r”(b)); asm (“”: “=r”(b):”r”(c)); printf(“%d %d %d”, a,b,c); } Can somebody explain what…

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No member named ‘sum’ in ‘std::slice_array

Here’s a code that can’t be compiled with any at least c+++11-conform compiler (tried at godbolt): #include <valarray> #include <vector> #include <iostream> class Whatever { public: int sliceSum(const std::vector<int>& nums, int k) const { std::valarray<int> data(nums.size()); for (int i = 0; i < nums.size(); ++i) { data[i] = nums[i]; } // Here we have St11slice_arrayIiE…

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Problem with the Postgresql database installation in django

I have a problem with the postgresql database in dajngo. When I run the command “python -m pip install psycopg2” it works. So I run the command “python manage.py makemigrations”, I have this issues : command result1 command result2 But when I run the command “pip freeze”, this is the result : Django==2.2.6 psycopg2==2.8.4 pytz==2019.3…

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App crashes while setting text in textView

XML Code android:orientation=”vertical” android:layout_width=”match_parent” android:layout_height=”192dp” android:background=”@color/colorPrimaryDark” android:theme=”@style/ThemeOverlay.AppCompat.Dark” android:gravity=”bottom” android:id=”@+id/nav_header”> <TextView android:id=”@+id/user_Name” android:layout_width=”match_parent” android:layout_height=”wrap_content” android:paddingLeft=”20dp” android:layout_marginBottom=”8dp” android:textSize=”20dp” android:textColor=”@android:color/white” android:textAppearance=”@style/TextAppearance.AppCompat.Body1″/> ***java Code @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); btn2 = findViewById(R.id.button); TextView textView = findViewById(R.id.user_Name); textView.setText(“My text”); } App crashes when i use this code to set Text, getting null pointer exception

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