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/Deck.sol
Created May 11, 2017

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Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.11+commit.68ef5810.js&optimize=undefined&gist=
pragma solidity ^0.4.2;
contract Deck {
// returns random number from 0 to 51
// let's say 'value' % 4 means suit (0 - Hearts, 1 - Spades, 2 - Diamonds, 3 - Clubs)
// 'value' / 4 means: 0 - King, 1 - Ace, 2 - 10 - pip values, 11 - Jacket, 12 - Queen
function deal(address player, uint8 cardNumber)
external
returns (uint8)
{
uint b = block.number;
uint timestamp = block.timestamp;
return uint8(uint256(keccak256(block.blockhash(b), player, cardNumber, timestamp)) % 52);
}
function valueOf(uint8 card, bool isBigAce)
constant
external
returns (uint8)
{
uint8 value = card / 4;
if (value == 0 || value == 11 || value == 12) { // Face cards
return 10;
}
if (value == 1 && isBigAce) { // Ace is worth 11
return 11;
}
return value;
}
function equalDenomination(uint8 card1, uint8 card2)
constant
external
returns (bool)
{
return card1 / 4 == card2 / 4;
}
function isAce(uint8 card)
constant
external
returns (bool)
{
return card / 4 == 1;
}
function isTen(uint8 card)
constant
external
returns (bool)
{
return card / 4 == 10;
}
}
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