# What is meant by variable?

## What is meant by variable?

A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable.

## What makes a good variable name?

The variable name must describe the information represented by the variable. A variable name should tell you specifically in words what the variable stands for. Your code will be read more times than it is written. Prioritize how easy your code is to understand rather than how quickly it is written.

## How do you name a function?

When naming a function, variable or class, you should keep the following things in mind:

1. Choose a word with meaning (provide some context)
2. Avoid generic names (like tmp )
3. Attach additional information to a name (use suffix or prefix)
4. Don’t make your names too long or too short.
5. Use consistent formatting.

## How do you know if a variable is constant?

The number before an alphabet (variable) is called a constant. Variable : A symbol which takes various numerical values is called a variable. The alphabet after a number (constant) is called a variable. In the formulas d = 2r; 2 is a constant whereas, r and d are variables.

## What is constant give example?

In Algebra, a constant is a number on its own, or sometimes a letter such as a, b or c to stand for a fixed number. Example: in “x + 5 = 9”, 5 and 9 are constants.

## What are variables give examples?

A symbol for a value we don’t know yet. It is usually a letter like x or y. Example: in x + 2 = 6, x is the variable. But in something like y = x + 2 (a linear equation) x can have many values. In general it is much easier to always call it a variable even though in some cases it is a single value.

## What are the rules of naming variables?

Rules for naming a variable

• A variable name can only have letters (both uppercase and lowercase letters), digits and underscore.
• The first letter of a variable should be either a letter or an underscore.
• There is no rule on how long a variable name (identifier) can be.

## What are computer variables?

Variables are data values that can change when the user is asked a question, for example, their age. Variables may change during program execution. A variable is a memory location . It has a name that is associated with that location. The memory location is used to hold data.

## Why do we use constant variables?

Constants are useful for defining values that are used many times within a function or program. By using constants, programmers can modify multiple instances of a value at one time. For example, changing the value assigned to max in the example above will modify the value wherever max is referenced.

## What is the dependent variable answer?

A dependent variable is what you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable. It is called dependent because it “depends” on the independent variable.

## What is a good variable?

A good variable name should: Be clear and concise. Be written in English. A general coding practice is to write code with variable names in English, as that is the most likely common language between programmers. Thus, variable names such as muuttuja (which is also not a good name on other levels) should be avoided.

## Why do we write meaningful variable names in our code?

Variable naming is an important aspect in making your code readable so, you should follow a simple idea: Create variables that describe their function. This is important because when you write code, you must keep in mind that other developers will read, and they will need to understand what you write.

## How do you write a good function?

Functions

1. 1st rule – Functions should be small.
2. 2nd rule – Functions should be smaller than that!
3. Functions should barely be 20 lines long…
4. Each function should lead you to the next function in a compelling order – like telling a story.
5. They should do ONE thing.

## Which is the best example of a dependent variable?

The dependent variable is the variable that is being measured or tested in an experiment. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants’ test scores, since that is what is being measured.

## Can there be 2 dependent variables?

No. The value of a dependent variable depends on an independent variable, so a variable cannot be both independent and dependent at the same time. It must be either the cause or the effect, not both!

## What is variable and constant explain with example?

In an algebraic expression, x+y = 8, 8 is a constant value, and it cannot be changed. Variables: Variables are the terms which can change or vary over time. It does not remain constant, unlike constant. For example, the height and weight of a person do not remain constant always, and hence they are variables.

## What are some other examples of dependent and independent variables?

Independent and dependent variables

Research Question Independent variable(s) Dependent variable(s)
How well do different plant species tolerate salt water? The amount of salt added to the plants’ water Plant growth Plant wilting Plant survival rate

## What is constant variable and algebraic expression?

Constants are the terms in the algebraic expression that contain only numbers. That is, they’re the terms without variables. We call them constants because their value never changes, since there are no variables in the term that can change its value.

## What is a dependent variable in research?

Definitions. Dependent Variable. The variable that depends on other factors that are measured. These variables are expected to change as a result of an experimental manipulation of the independent variable or variables.

## Can time be a dependent variable?

Time is a common independent variable, as it will not be affeced by any dependent environemental inputs. Time can be treated as a controllable constant against which changes in a system can be measured.

## Why do we use variables?

Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves. It is helpful to think of variables as containers that hold information.

## What is constant and variable in computer?

In computer programming, a constant is a value that should not be altered by the program during normal execution, i.e., the value is constant. This is contrasted with a variable, which is an identifier with a value that can be changed during normal execution, i.e., the value is variable.

## How many dependent variables do you want in an experiment?

two dependent variables