Should variables be declared at the top?

It’s best to declare variables when you first use them to ensure that they are always initialized to some valid value and that their intended use is always apparent. The alternative is typically to declare all variables in one location, typically at the top of the block or, even worse, at the top of a function.

Is it bad practice to declare variables in a loop?

It’s not a problem to define a variable within a loop. In fact, it’s good practice, since identifiers should be confined to the smallest possible scope. What’s bad is to assign a variable within a loop if you could just as well assign it once before the loop runs.

Are class variables bad practice?

2 Answers. If you declare it as private it’s okay. What it would be a very bad practice is to declare it as public . You are good as long as you keep it private , since that way you’ll make sure it is accessible only from within that class .

In which order the variables should be declared while writing a class?

12 Answers. Declare variables as close to the first spot that you use them as possible. It’s not really anything to do with efficiency, but makes your code much more readable. The closer a variable is declared to where it is used, the less scrolling/searching you have to do when reading the code later.

Why should a variable not be declared?

Why should a variable not be declared as a module variable? a.) It prevents a procedure from being self contained. Local variable names can be reused in other procedures.

Where should you declare your variables?

1 Answer. Rule of thumb: variables should always be in – or as close as possible to – the scope where they are needed. Another way to phrase it is that variables should be enclosed inside the context in which they make sense and are actually useful.

Can you declare variables in for loop?

Often the variable that controls a for loop is needed only for the purposes of the loop and is not used elsewhere. When this is the case, it is possible to declare the variable inside the initialization portion of the for.

Is it bad practice to use static variables?

Static variables are generally considered bad because they represent global state and are therefore much more difficult to reason about. In particular, they break the assumptions of object-oriented programming.

Are static variables good practice?

Static Methods/Variables are bad practice. In short: Yes. Static methods allow procedural/functional code to be shoe-horned into an Object Oriented world. Using static methods and variables breaks a lot of the power available to Object-Oriented code.

Do uninitialized variables pose any danger in a program?

According to new Georgia Institute of Technology research, uninitialized variables – largely overlooked bugs mostly regarded as insignificant memory errors — are actually a critical attack vector that can be reliably exploited by hackers to launch privilege escalation attacks in the Linux kernel.

Where should variables be declared?

A declaration of a variable is where a program says that it needs a variable. For our small programs, place declaration statements between the two braces of the main method. The declaration gives a name and a data type for the variable. It may also ask that a particular value be placed in the variable.

Is it bad practice to initialize a static variable with global state?

But yes, the global state is the concern here. Not so much the use of a local static variable to implement its initialization. Global states, especially mutable global states, are bad in general and should never be abused.

Why do we declare variables inside of a loop?

Declaring variables inside or outside of a loop, It’s the result of JVM specifications But in the name of best coding practice it is recommended to declare the variable in the smallest possible scope (in this example it is inside the loop, as this is the only place where the variable is used). Declaring objects in the smallest scope improve

Why can’t I check the static Bool init value in SomeClass?

Other functions in SomeClass couldn’t check the static bool init value because it’s visibility is limited to the void SomeClass::function () scope. The static variables aren’t OOPish because they define a global state instead of a object state.

Can a variable be accessed from a function other than main?

It can be accessed from functions other than, and including, main (); is guaranteed to live until program executes; and is set to 0 before first use. In the second example, variable is a function local variable.