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Sometimes, you may come across a situation, when you want to have a function, which can take variable number of arguments, i.e., parameters, instead of predefined number of parameters. The C/C++ programming language provides a solution for this situation and you are allowed to define a function which can accept variable number of parameters based on your requirement. The following example shows the definition of such a function.int func(int, ... ) { . . . } int main() { func(1, 2, 3); func(1, 2, 3, ... Read More
Searching for specific files in a directory is a difficult task, and this can be accomplished by using different tools in Python. In this article, we will see how to find all the files in a directory with an extension .txt using Python. Here are the different approaches, let's see one by one in detail - Using os.listdir() The os.listdir() is a function from Python's built-in os module which returns a list of names, i.e., as strings, of the entries in the directory given by the path. Example In this example, we will use the function in Python's os.listdir() to ... Read More
Python is a high-level programming language that helps users to run a program and integrate systems more efficiently, as it executes a program in comparatively fewer lines of code. In Python programming language, a code can be executed in two ways - Interactive Mode Script Mode In this article, we will learn how to execute a Python program in script mode on Windows. However, the steps are almost the same for other operating systems.Python Script Mode Script mode in Python allows us to write Python code in files with the .py extension and run the entire program at ... Read More
Python is a high-level programming language that helps a user to run a program and integrate systems more efficiently, as it executes a program in comparatively fewer lines of code. In Python programming language, a code can be executed in two ways - Interactive Mode Script Mode In this article, we will learn how to execute Python code in Interactive mode in Windows. However, the commands are almost the same in other operating systems as well. Interactive Mode Interactive mode in Python is a built-in feature that allows users to execute Python commands one line at a time. ... Read More
To run a Python file in a directory, we generally use the Python or python3 command. However, it only runs a single file at a time. But executing one file each on a shell script seems hectic. Therefore, we must come up with a way to execute all files present in a directory simultaneously. In this article, let's go through the different methods to run all the Python files in a directory at a time. Using subprocess Module Using exec() function Using shell scripts Using multiprocessing Using subprocess.run() The subprocess ... Read More
Whenever we try to load a class, ClassNotFoundException occurs when the application tries to load a class at runtime using methods like Class.forName() or ClassLoader.loadClass(), but the JVM cannot locate the class in the classpath. The following are the reasons of ClassNotFoundException occurence and they are - Incorrect Class Name Incorrect Package Structure ... Read More
When working with text data in Python, we normally need to interact with strings to make them readable or properly formatted. It is very common way to use regular expressions or regex to add spaces before and after a particular character. In this article we will see how to do this by using Python's re module.Adding Space at a Character Using regex Regular expressions are a powerful way to search for and modify strings based on patterns. There are multiple uses for regex that are made possible by Python's re package. Spaces between characters can improve the readability and the ... Read More
In Java, the EventListener interface defines the methods that must be implemented by an event handler for a particular kind of event, whereas an Event Adapter class provides a default implementation of the EventListener interface. Java EventListener The EventListeners are the backbone of every component to handle the events. Every method of a particular EventListener will have a single parameter as an instance, which is a subclass of the EventObject class. An EventListener interface needs to be extended, and it will be defined in java.util package. Syntax The following is the syntax for EventListener declaration: public interface EventListener EventListener interfaces ... Read More
To extract decimal numbers from a string in Python, regular expressions are used. A regular expression is a group of characters that allows you to use a search pattern to find a string or a set of strings. RegEx is another name for regular expressions. The re module in Python is used to work with regular expressions. In this article, we will learn how to extract decimal numbers from a string in Python using regular expressions. We use the following regular expression in Python to get non-digit characters from a string - \d+\.\d+ Where, ... Read More
A Java program can execute in the Java Virtual Machine (JVM) and uses the heap memory to manage the data. If our Java program requires more memory, there is a possibility that the Java Virtual Machine(JVM) will begin to throw OutOfMemoryError instances when attempting to instantiate an object in Java. How to change/increase the JVM Heap Size? In Java, it is possible to increase the heap size allocated by the JVM: -Xms: Set an initial Java heap size JVM automatically manages the heap memory but we can ... Read More