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example5.sol
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example5.sol
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pragma solidity >0.4.10;
//the very fifth example
contract Example5 {
event Message(
string msg
);
mapping (address => uint) accounts; //maps an address to an integer
function getContractBalance() public view returns (uint256){
return address(this).balance;
}
function deposit() public payable { //payable means that you can send ether to the contract (depositing in the accounts array mantained by the smart contract)
accounts[msg.sender] += msg.value;
emit Message("deposit!");
}
function balance() public view returns (uint) { //return the balance of your account
return accounts[msg.sender];
}
function withdraw(uint amount) public returns (bool){ //withdraw funds from your account
if(accounts[msg.sender] >= amount) {
accounts[msg.sender]-= amount;
msg.sender.transfer(amount); //transfer the amount from the smart contract to the sender of the msg
emit Message("withdraw!");
return true;
}
emit Message("no withdraw!");
return false;
}
}