contract_solidity_demo.solid

pragma solidity ^0.4.0;
contract MyCoins {
    
    mapping(address => uint) balances;

    function MyCoins(address owner) public {
        balances[owner] = 1000000;
    }

    function tranferCoins(address sender, address receiver, uint amount) public {
        if ( balances[sender] >= amount ) {
                balances[sender] = balances[sender] - amount;
                balances[receiver] = balances[receiver] + amount;
        }
    }



}