Here is a function syntax for declaration. Be Careful When Using the Solidity Fallback Function Solidity by Example - Plian pragma solidity 0.8.10; contract C {uint balance = 0; // Payable function that allows other contracts // to send ether to this contract. ethereum - payable() function In solidity - Stack Overflow Introduction to Types of Solidity - BLOCKGENI default: non-payable. The following contract is quite complex, but showcases a lot of Solidity's features. Function Modifiers are used to modify the behaviour of a function. Allow nonpayable functions to override payable functions #11253 . The following contract showcases a lot of Solidity's features. Of course, the main problems of electronic voting is how to assign voting rights to the correct persons and how to prevent manipulation. Solidity is an Object-Oriented High-level programming language for writing smart contracts (programs) on the Ethereum blockchain. This post will discuss Solidity's anonymous "fallback function", which is a commonly used mechanism for accepting ether transfers. function function-name (parameter-list) scope returns () { //statements } Example Explanation of Solidity by Example - BLOCKGENI function functionname () <visibility-specifier> <modifier> returns (type) { return typevalue; } function is a keyword in solidity. The visibility determines whether a function can be called externally by users, by other derived contracts, only internally or only externally. // Sending Ether to this contract will cause an exception, // because the fallback function does not have the "payable" // modifier. Transfers and approval of ERC-20 tokens from a solidity smart contract constructor payable {} function claimPayment (uint256 amount, uint256 nonce, bytes memory signature) external {require (! Any rules surrounding the exchange cannot be altered once on the blockchain. Functions that have red buttons are payable functions in Solidity. Getting Started With Solidity - DEV Community External functions are sometimes more efficient when they receive large arrays of data. The keyword payable // is required for the function to // be able to receive Ether. Solidity - Functions - Tutorials Point