Understanding Computer Science Variables

Front

What is a variable in computer science?

Back

A variable is a symbolic name for a storage location in memory that can hold a value and may change during program execution.

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How do you declare a variable in Python?

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You declare a variable in Python by using the syntax: variable_name = value.

Front

What is the difference between a local and a global variable?

Back

Local variables are scoped to a function or block, while global variables are accessible throughout the entire program.

Front

What data types can a variable hold? Options: Integers, floats, strings, booleans, arrays, objects, null, Images, videos, sounds, documents, Functions, methods, classes, interfaces, Characters, lists, sets, tuples

Back

Integers, floats, strings, booleans, arrays, objects, null

Front

How do you change the value of a variable?

Back

Use the assignment operator to assign a new value to the variable.

Front

What is variable scope?

Back

Variable scope is the context that determines the accessibility and lifetime of a variable in a program.

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What is the purpose of a constant variable?

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The purpose of a constant variable is to hold a value that cannot be altered after its initial assignment.

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Can a variable name start with a number?

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No, a variable name cannot start with a number.

Front

What is type casting in relation to variables?

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Type casting is the conversion of a variable from one data type to another.

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How do you concatenate strings stored in variables?

Back

Use the '+' operator or a concatenation method to combine the strings.