What is variable?

Question

variables are allocated memory to store data. compiler allocate memory,based on the data type of the variable. variables must be declared before they are used.
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Answer 1

In simple variables are user defined name given to the memory location
In c++ a variable must be declared before the use
Eg:int a= 5;
int is the data type that is integer
a is the name of variable
5 is value assigned

Answer 2

variables are memories to store data

Answer 3

a variable is a memory location that you can assign information on it.