examples/solidity-access-modifiers

AccessModifiers.sol

pragma solidity >=0.5.0;

contract AccessModifiers {
    // Public modifer exposes a getter for state variable
    string public myString;
    // Private variable only accessible within contract
    string private myPrivateString;

    // Internal functions can only be used within this contract
    function innerFunction() internal {}
    // External functions are part of the contract interface and can be called from outside
    function outerFunction() external {}
}