Solidity Notes

 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.