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If there are repeated values are present in an array in C, then we can use shorthand array notation to define that array. For example, int array[10] = {[0 ... 3]7, [4 ... 5]6, [6 ... 9]2}; // This specifies that index 0-3 will be 7 // index 4-5 will be 6 // and index 6-9 will be 2 // This notation is equivalent to int array[10] = {7, 7, 7, 7, 6, 6, 2, 2, 2, 2}; Example Code Here is an example code that demonstrates the shorthand array notation in C: #include ... Read More
Dynamic arrays are a type of array that can change their size when new elements are added or removed. They are created using pointers and memory management operators like new and delete. In this article, we will learn how to create and use a dynamic array in C++. What is Dynamic Array? A dynamic array is an array that can change its size during runtime. This is different from a static arrays, which have a fixed size determined by the programmer at compile time. Dynamic arrays are used when the size of the array is not known at compile ... Read More
A forward declaration informs the compiler that a class, function, or variable is declared earlier, but it will be defined later in the code. In this article, our task is to understand the forward declaration and when to use it. When is Forward Declaration Used in C/C++? The forward declaration can be used in C/C++ in the following cases: In C++, it is used for declaring a friend function. Using the forward declaration, we can reduce the header files that we include in the code. When ... Read More
Argparse is a Python module that helps you create easy-to-use command-line interfaces. When building these interfaces, it is important to handle invalid arguments properly to give clear feedback to users and prevent your program from crashing unexpectedly. There are several ways to handle invalid arguments in argparse. You can catch errors using try-except blocks, restrict allowed options with choices, validate inputs with custom functions and error messages, or control the number of arguments using nargs. Using these methods makes your command-line programs more reliable and user-friendly. Using try and except Blocks One simple method to handle invalid arguments is ... Read More
Python threads do not automatically pass exceptions to the caller thread. To catch thread exceptions in the main thread, you can use custom thread classes, the ThreadPoolExecutor with futures, or a shared queue. Using a Wrapper with threading.Thread The easiest way to catch exceptions in a thread is to wrap the target function in a try-except block. You can then store the exception in a shared variable or object so it can be checked later from the main thread. Example In this example, we create a custom thread class that stores any exceptions in an instance variable. After the ... Read More
In Python, you can catch an exception and raise a new one, while keeping the original exception for more details. This helps when you want to change a low-level error into a clearer, higher-level error that fits your application better. Sometimes, catching a specific exception and raising a new one helps you to handle problems or give a clearer message. Python lets you do this using the raise NewException from OriginalException syntax. Rethrowing with a New Exception Type You can rethrow an exception using the from keyword to keep the original error details and traceback. This helps you provide ... Read More
Python allows you to run multiple tasks at the same time using threads. However, handling exceptions in threads can be tricky because exceptions that happen inside a thread don't get passed to the main thread by default. To deal with this, you can catch errors inside the thread's function or create a custom thread class to handle them. This helps you to find issues in threads and handle them properly in the main program. Exception Handling in Threads When an exception occurs inside a thread, it only affects that thread, and unless explicitly handled, it will be ignored silently. ... Read More
The OSError in Python is commonly encountered when a system-related error occurs, such as a file not found, permission denied, or disk I/O errors. It is one of the built-in exceptions that helps in handling operating system-level failures. In this article, you will learn how to catch and handle OSError using try-except blocks with examples. When Does OSError Occur? OSError may occur in the following situations - Trying to open a non-existent file. Permission denied while accessing a file or directory. Invalid file path or I/O operation failures. Example: File Not Found In the following example, we try ... Read More
You cannot directly use an if statement to catch exceptions in Python. Instead, use a try-except block and place if conditions inside the except to respond differently based on the type or message of the exception. This allows you to write conditional logic for exception handling. Using if Inside the except Block You can write if conditions inside the except block to check the type or details of the exception and take appropriate action. Example: Matching Exception Message with "if" In this example, we catch a ValueError and use if statement to inspect its message - def process_input(value): ... Read More
The NotImplementedError exception in Python is raised when an abstract method or operation that should be implemented by a subclass is not implemented. It is commonly used as a placeholder in base classes to indicate that subclasses are expected to override the method. In this article, you will learn how to catch and handle the NotImplementedError in Python using simple examples. When Does NotImplementedError Occur? The NotImplementedError is usually raised in the following cases - A method is defined in a base class but is not implemented and used as a placeholder for child classes to override. The subclass ... Read More