The answer
In languages like C++, it will hold random 'garbage' data from memory. In Java, it will throw an error or default to zero. In Python, variables must be initialized to exist.
Variables and Memory Allocation Basics
What happens if I don't initialize a variable?
More FAQs in Variables and Memory Allocation Basics
A variable is a named storage location in the computer's memory used to hold data that can be modified or accessed during program execution.
RAM (Random Access Memory) is the computer's short-term memory where it stores the variables and data for programs that are currently running.
A constant is a type of variable whose value cannot be changed once it is initialized (e.g., using 'const' in JS or 'final' in Java).
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