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Initializing multiple variables in C++

By Md Shoriful Islam
  Initializing multiple variables In the last section, we noted that it is possible to define multiple variables  of the same type  in a single statement by separating the names with a comma: int a , b ; COPY We also noted that best practice is to avoid this syntax altogether. However, since you may encounter other code that uses this style, it’s still useful to talk a little bit more about it, if for no other reason than to reinforce some of the reasons you should be avoiding it. You can initialize multiple variables defined on the same line: int a = 5 , b = 6 ; // copy initialization int c ( 7 ) , d ( 8 ) ; // direct initialization int e { 9 } , f { 10 } ; // brace initialization (preferred) COPY Unfortunately, there’s a common pitfall here that can occur when the programmer mistakenly tries to initialize both variables by using one initialization statement: int a , b = 5 ; // wrong (a is not initialized!) int a = 5 , b = 5 ; // correct...
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Value initialization and zero initialization in C++

By Md Shoriful Islam
  Value initialization and zero initialization When a variable is initialized with empty braces,  value initialization  takes place. In most cases,  value initialization  will initialize the variable to zero (or empty, if that’s more appropriate for a given type). In such cases where zeroing occurs, this is called  zero initialization . int width { } ; // zero initialization to value 0 COPY Q: When should I initialize with { 0 } vs {}? Use an explicit initialization value if you’re actually using that value. int x { 0 } ; // explicit initialization to value 0 std :: cout << x ; // we're using that zero value COPY Use value initialization if the value is temporary and will be replaced. int x { } ; // value initialization std :: cin >> x ; // we're immediately replacing that value COPY Initialize your variables Initialize your variables upon creation. You may eventually find cases where you want to ignore this advice for a specific r...
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Variable assignment and initialization in C++

By Md Shoriful Islam
  Initialization One downside of assignment is that it requires at least two statements: one to define the variable, and one to assign the value. These two steps can be combined. When a variable is defined, you can also provide an initial value for the variable at the same time. This is called  initialization . The value used to initialize a variable is called an  initializer . Initialization in C++ is surprisingly complex, so we’ll present a simplified view here. There are 4 basic ways to initialize variables in C++: int a ; // no initializer int b = 5 ; // initializer after equals sign int c ( 6 ) ; // initializer in parenthesis int d { 7 } ; // initializer in braces COPY You may see the above forms written with different spacing (e.g.  int d{7}; ). Whether you use extra spaces for readability or not is a matter of personal preference. Default initialization When no initialization value is provided (such as for variable  a  above), this is...
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Whiteboarding Interviews

By Md Shoriful Islam
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 ⭕ Whiteboarding interviews are a common way of assessing the technical and non-technical skills of candidates for software development positions. They involve solving a coding problem or designing a system on a whiteboard, either in person or virtually, while explaining your approach and reasoning to the interviewer.  ⭕ Some of the benefits of whiteboarding interviews are that they can test your problem-solving ability, communication skills, and coding proficiency in a realistic scenario. They can also help you demonstrate your creativity, collaboration, and passion for the role. However, some of the drawbacks of whiteboarding interviews are that they can be stressful, artificial, and biased. They can also favor memorization over understanding and overlook other aspects of your skills and experience.  ⭕ If you want to ace a whiteboarding interview, you should practice beforehand, prepare for the interview setting, set objectives and expectations, create a good candidate ...
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Version Control with Git: A Beginner’s Guide

By Md Shoriful Islam
Version Control with Git: A Beginner’s Guide If you are a developer, you probably know how important it is to keep track of your code changes and collaborate with other developers on a project. But how do you do that effectively and efficiently? The answer is version control. Version control is a system that records changes to a file or set of files over time so that you can recall specific versions later. It allows you to revert files back to a previous state, compare changes over time, see who last modified something, and more. Version control also enables you to work with other developers on the same code base without stepping on each other’s toes. One of the most popular version control systems in the world is Git. Git is a free and open source distributed version control system that is designed to handle everything from small to very large projects with speed and efficiency. Git has many features that make it superior to other version control systems, such as: Cheap local branchin...
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Callback function in JavaScript

By Md Shoriful Islam
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Callback function in JavaScript What is a callback function in JavaScript? A callback function is a function that is passed as an argument to another function and is executed after the first function has completed its task. Callback functions are useful for handling asynchronous events, such as network requests, file operations, or timers. For example, you can use a callback function to display the result of a calculation after the calculation is done. Callback function in JavaScript Here is a simple example of a callback function in JavaScript: // Define a function that takes a callback as an argument function sayHello (callback) { // Do some task console .log ("Hello, world!"); // Invoke the callback function callback (); } // Define another function function sayGoodbye () { // Do some task console .log ("Goodbye, world!"); } // Call the first function and pass the second function as a callback sayHello (sayGoodbye); // The output will be: // Hello, wo...
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