Functions in solidity by Payment/Fund Transfer capability allows you to program your smart contract to send out fund to a wallet(s).

1. Public State Variable Function
For Example When you add "Public" to a state variable it auto create View/Getter function to access the variable data value.

Examples use case: check source code below

Public State Variable Function is written in solidity as:

uint public totalDeposited; //create a View/Getter Function by automatically to check the value/balance of totalDeposited

uint totalDeposited; //without the public added, the totalDeposit balance will be hidden but still accessible for any one or program to call and executed to check the value within and outside your smart contract.

2. Private State Variable Function
For Example When you add "Private" to a state variable it auto create View/Getter function to access the variable data value but limit its call and accessibility to only functions within the same Smart contract and prevent outsider from calling the variable to check the variable value or content it holds..

Examples use case: check source code below

Private State Variable Function is written in solidity as:

uint private totalDeposited; //create a View/Getter Function by automatically to check the value/balance of totalDeposited only by the functions within the smart contract itself.

uint totalDeposited; //without the public/private added, the totalDeposit balance will be hidden but still accessible for any one or program to call and executed to check the value within and outside your smart contract.

Want to know how to make your smart contract receive funds in solidity? Then checkout this Payable Functions in Solidity

Example PUBLIC VARIABLE Function Source Code Used in THE FREE Course VIDEO ABOVE You Should Copy and Use To Do the above Exercise

pragma solidity 0.8.7;

contract VariableFunction {

/*
SC SUMMARY: To learn about Functions By Variable Accessibility in solidity.
*/

//mapping balance
mapping (address => uint) public Balance;

//track SC all users total Deposited Balance
uint public totalDeposited;

//PAYABLE FUNCTION - Deposited
function depositEther() public payable {

//track deposit to mapping
Balance[msg.sender] += msg.value;

//add to total SC deposited Balance
totalDeposited += msg.value;

}

//Check Balances
function etherBalance() public view returns(uint, uint) {

return (Balance[msg.sender], totalDeposited);

}

/*
//PAYABLE FUNCTION - Transfer/Withdraw
function withdrawEther(uint _ethAmount) public {

//SC Transfers to user wallet
msg.sender.transfer(_ethAmount);

//withdrawEther
Balance[msg.sender] -= _ethAmount;

//totaDepositWithdraw
totalDeposited -= _ethAmount;

}
*/

}