State Variables in Solidity - Ethereum Blockchain

 State Variable:

                            Any variable that is declared at contract level is known as state variable.

Example:

Properties:

--> State variables are stored in Blockchain.

--> During declaration, state variables are permanently stored in the contract storage.

--> A certain amount of gas must be paid.

--> Higher the number of variables, higher the amount of gas.

--> During declaration, the default value of a variable is the default value of datatype.

--> There is no concept of "null" or "garbage" in Solidity.

We can check value by:

unit public age;

When the keyword public is written, a function is automatically created (get function). By this we can access the value of the variable.