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Programming Articles
Page 2526 of 2547
How do we use a #line directive in C#?
It lets you modify the compiler's line number and (optionally) the file name output for errors and warnings. Let us see some examples. #line 100 "demo" int a; // CS0168 on line 100 int b; // CS0168 on line 101 int c; // CS0168 on line 102 As shown above the example reports three warnings associated with line numbers. The #line 100 directive forces the line number to be 100 and until the next #line directive, the filename will be reported as "demo”. Let’s see ...
Read MoreHow does "do something OR DIE()" work in Perl?
The die() function can be used to stop the script and can be used to display a message to the end user. It can be used at the right side of the OR ( || ) operator and at left side can be any expression like the eval() function. Case 1 − Using die() function with no parameter The following is the output. Now we can use $! to print the error number and a message to the user in the die() function. Case 2 − Use of $! in the die() function The following is the ...
Read MoreMethods of the Thread Class
Some of the popular methods of a Thread class is start, sleep, jon, and abort. Let us see the complete list of methods − Sr.No. Method & Description 1 public void Abort() Raises a ThreadAbortException in the thread on which it is invoked, to begin the process of terminating the thread. Calling this method usually terminates the thread. 2 public static LocalDataStoreSlot AllocateDataSlot() Allocates an unnamed data slot on all the threads. For better performance, use fields that are marked with the ThreadStaticAttribute attribute instead. 3 public static LocalDataStoreSlot AllocateNamedDataSlot(string name) Allocates ...
Read MoreWhat is the difference between initialization and assignment of values in C#?
Let us understand the difference between initialization and assignment of values. Declaring an array. int [] n // declaring Initialization Declaring an array does not initialize the array in the memory. When the array variable is initialized, you can assign values to the array. Array is a reference type, so you need to use the new keyword to create an instance of the array. int n= new int[10]; // initialization Let’s assign value. You can assign values to individual array elements, by using the index number − n[0] = 100; n[1] = 200 ...
Read MoreWhat is the difference between a float, double and a decimal in C#?
Float , double and a decimal are all Value Types in C#. Value type variables can be assigned a value directly. They are derived from the class System.ValueType. The value types directly contain data. Float Value Type Float is a 32-bit single-precision floating point type with range 3.4 x 1038 to + 3.4 x 1038 Memory Size is 4 bytes. float a = 3.5f; Double Value Type Double is a 64-bit double-precision floating point type with range (+/-)5.0 x 10-324 to (+/-)1.7 x 10308 Memory Size is 8 bytes. double d = 5.78788 Decimal Value ...
Read MoreWhat is the difference between overriding and hiding in C#?
Method hiding is also called shadowing in C#. The method of the parent class is available to the child class without using the override keyword in shadowing. The child class has its own version of the same function. Define a behavior that is specific to the subclass type in overriding, you, which means a subclass can implement a parent class method based on its requirement. Hiding redefines the complete method, whereas overriding redefines only the implementation of the method. In Overriding, you can access the base class using the child class’ object overridden method.. Shadowing has cannot access the ...
Read MoreRecommended IDEs for C# on Windows/Linux/Mac OS
The best IDE for C# on Windows is Microsoft Visual Studio. It is an IDE to develop websites, web apps, mobile apps, etc. The following are the features of Visual Studio IDE − Code Editor − Visual Studio has a code editor supporting syntax highlighting and code completion using IntelliSense. Breakpoints − Set breakpoints and allow monitoring the variable values as the execution progress. Extend Capability − With Visual Studio, you can extend the functionality of the IDE. The extension includes macros, packages, etc. Built-in-languages − Visual Studio supports more than 30 programming ...
Read MoreUnderscore(_) in Python
In Python in some cases we use Single Underscore(_) and some cases we use Double Underscores (__). In Python has following cases, where we use underscore. If we want to store the value of last expression in interpreter. If we want to ignore some values. For declaration of variable or function. To separate digits of number lateral value. It is also used as ‘Internationalization (i18n)’ or ‘Localization (l10n)’ functions. Now some examples on every cases. Used in interpreter The Python Interpreter stores the last expression value in the '_'. >>> 20 20 >>> _ ...
Read MorePlotting solar image in Python
In Python provides SunPy package for create solar image. In this package has different files which are solar data of proton/electron fluxes from various solar observatory and solar labs. Using pip install sunpy command, we can install sunpy package. Here we plot a sample AIA image. AIA is Atmospheric Imaging Assembly. This is another instrument board of the SDO. Here we use sunpy.Map() function to create a map from one of the supported data products. Example code import sunpy.map import matplotlib.pyplot as plt import sunpy.data.sample my_aia = sunpy.map.Map(sunpy.data.sample.AIA_171_IMAGE) fig = plt.figure() ax = plt.subplot(111, projection=my_aia) my_aia.plot() my_aia.draw_limb() ...
Read MoreBirthday Reminder Application in Python
In this section we will see how to create a birthday reminder application using Python. Problem Statement Create an application using Python, which can check whether there is any birthday on the current day or not. If it is the birthday of some listed person, send a notification to the System with the name of that person. We need a file, where we can store the date and month and the name of the person as a lookup file for this application. The file will look like this − Here we will convert this application to a start-up application ...
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