Notes

• Constants are variables that cannot be modified.
• Their value is hard coded and using constants can save gas cost.

Code

Compile and deploy the code block below:

solidity
Constants.sol
Copy
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Constants {
   // coding convention to uppercase constant variables
   address public constant MY_ADDRESS = 0x777788889999AaAAbBbbCcccddDdeeeEfFFfCcCc;
   uint public constant MY_UINT = 123;
}