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Smart Contract samples

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NexThoughts Technologies

The document contains code for 6 sample smart contracts: 1) An Adder contract that allows adding two integers and setting/getting a name string 2) A Greeter contract that allows setting/getting a greeting string 3) An AuditLog contract that logs a uid, audit details, and date 4) A Voting contract that allows voting for candidates and getting vote counts 5) A FeverContract that tracks temperature, allows increasing/decreasing it, and checks for fever 6) Each contract code includes functions for setting/getting values and other relevant logic

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Adder pragma solidity ^0.4.2; contract adder{ string name; function setName(string _name) public { name = _name; } function getName() constant returns (string){ return name; } function add(int a, int b){ return a+b; } } GreeterSample pragma solidity ^0.4.2; contract greeter{ string greeting; constructor(string _greeting) public{ greeting = _greeting; } function greet() constant public returns (string){ return greeting; } function setGreeting(string _greeting) public{ greeting = _greeting; } function greet2() constant public returns (string){ return "ethereum sample"; } } AuditLogSample pragma solidity ^​0.4.2​; contract auditlog{ string uid; string audit; string date;
function​ ​auditlog​(​string _uid, string _audit, string _date​){ uid= _uid; audit= _audit; date= _date; } function​ ​getUid​() ​constant​ ​returns​ (​string​){ return​ uid; } function​ ​getAudit​() ​constant​ ​returns​ (​string​){ return​ audit; } function​ ​getDate​() ​constant​ ​returns​ (​string​){ return​ date; } } VotingSample pragma solidity ^​0.4.18​; contract Voting { mapping (​bytes32​ => uint8) public votesReceived; bytes32[] public candidateList; ​function​ ​Voting​(​bytes32[] candidateNames​) ​public​ { candidateList = candidateNames; } function​ ​totalVotesFor​(​bytes32 candidate​) ​view​ ​public​ ​returns​ (​uint8​) { ​require​(validCandidate(candidate)); ​return​ votesReceived[candidate]; } ​function​ ​voteForCandidate​(​bytes32 candidate​) ​public​ { ​require​(validCandidate(candidate)); votesReceived[candidate] += ​1​; } ​function​ ​validCandidate​(​bytes32 candidate​) ​view​ ​public​ ​returns​ (​bool​) { ​for​(uint i = ​0​; i < candidateList.length; i++) { ​if​ (candidateList[i] == candidate) { ​return​ ​true​; } } return​ ​false​; } } FeverContract pragma solidity ^​0.4.17​;
contract FeverContract { uint8 temperature; ​function​ ​FeverContract​(){ temperature = ​98​; } ​function​ ​getTemperature​() ​public​ ​constant​ ​returns​ (​uint8​) { ​return​ temperature; } ​function​ ​hasFever​() ​public​ ​constant​ ​returns​ (​bool​) { ​return​ temperature > ​100​; } ​function​ ​increaseTemp​() ​public​ ​returns​ (​uint8​) { ​if​ (temperature > ​110​) revert(); temperature += ​1​; ​return​ temperature; } ​function​ ​decreaseTemp​() ​public​ ​returns​ (​uint8​) { ​if​ (temperature < ​95​) revert(); temperature -= ​1​; ​return​ temperature; } }

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Smart Contract samples

  • 1. Adder pragma solidity ^0.4.2; contract adder{ string name; function setName(string _name) public { name = _name; } function getName() constant returns (string){ return name; } function add(int a, int b){ return a+b; } } GreeterSample pragma solidity ^0.4.2; contract greeter{ string greeting; constructor(string _greeting) public{ greeting = _greeting; } function greet() constant public returns (string){ return greeting; } function setGreeting(string _greeting) public{ greeting = _greeting; } function greet2() constant public returns (string){ return "ethereum sample"; } } AuditLogSample pragma solidity ^​0.4.2​; contract auditlog{ string uid; string audit; string date;
  • 2. function​ ​auditlog​(​string _uid, string _audit, string _date​){ uid= _uid; audit= _audit; date= _date; } function​ ​getUid​() ​constant​ ​returns​ (​string​){ return​ uid; } function​ ​getAudit​() ​constant​ ​returns​ (​string​){ return​ audit; } function​ ​getDate​() ​constant​ ​returns​ (​string​){ return​ date; } } VotingSample pragma solidity ^​0.4.18​; contract Voting { mapping (​bytes32​ => uint8) public votesReceived; bytes32[] public candidateList; ​function​ ​Voting​(​bytes32[] candidateNames​) ​public​ { candidateList = candidateNames; } function​ ​totalVotesFor​(​bytes32 candidate​) ​view​ ​public​ ​returns​ (​uint8​) { ​require​(validCandidate(candidate)); ​return​ votesReceived[candidate]; } ​function​ ​voteForCandidate​(​bytes32 candidate​) ​public​ { ​require​(validCandidate(candidate)); votesReceived[candidate] += ​1​; } ​function​ ​validCandidate​(​bytes32 candidate​) ​view​ ​public​ ​returns​ (​bool​) { ​for​(uint i = ​0​; i < candidateList.length; i++) { ​if​ (candidateList[i] == candidate) { ​return​ ​true​; } } return​ ​false​; } } FeverContract pragma solidity ^​0.4.17​;
  • 3. contract FeverContract { uint8 temperature; ​function​ ​FeverContract​(){ temperature = ​98​; } ​function​ ​getTemperature​() ​public​ ​constant​ ​returns​ (​uint8​) { ​return​ temperature; } ​function​ ​hasFever​() ​public​ ​constant​ ​returns​ (​bool​) { ​return​ temperature > ​100​; } ​function​ ​increaseTemp​() ​public​ ​returns​ (​uint8​) { ​if​ (temperature > ​110​) revert(); temperature += ​1​; ​return​ temperature; } ​function​ ​decreaseTemp​() ​public​ ​returns​ (​uint8​) { ​if​ (temperature < ​95​) revert(); temperature -= ​1​; ​return​ temperature; } }