what is a variable

Answer 1

A variable holds a value (of a determined type) that can be changed.

int i; //declaration of variable i, which can store an int
i = 10; //assignment of the value 10 to i
i = i + 32; //assignment of the value 10+32=42 to i

Answer 2

Variable is a object that can change of value, without matter data type

Answer 3

A variable holds the value of the data type declared,that can be changed during runtime

Answer 4

https://msdn.microsoft.com/en-us/library/hh147285(v=vs.88).aspx