Ethereum Cookbook

How to do it...

1. Consider the following contract. This is a simple contract that allows the user to deposit and withdraw the amount:

pragma solidity^0.4.24;contract Victim {    // Mapping to keep tract of user deposits    mapping (address => uint) private balances;    // Function to withdraw the contract balance    function withdraw() public {        uint amount = balances[msg.sender];        msg.sender.call.value(amount)();        balances[msg.sender] = 0;    }    // Function to deposit ether    function deposit() public payable {        balances[msg.sender] += msg.value;    }}

2. Here, the low-level call method is used to transfer funds to the caller address. If the target address is a contract, this method forwards all the gas remaining in the call to it. This executes any code present in ...