/Blockchain_hw3

Primary LanguageJavaScript

Blockchain_hw3

Solution:

  • Change the minimum contribution to 5 Ether

*uint256 public investorMinCap = 5000000000000000000;

  • Change the minimum contribution to 5 Ether

  • function getTokensLeft() view public returns (uint256) {

    uint256 tokensLeft = cap - totalSpent;

    return tokensLeft;

}

  • 1 purchase per account

  • require(_existingContribution == 0, "error:1 purchase per account");

How to run:

Before test:

  • truffle compile
  • truffle develop
  • migrate --reset

Example:

  • ExampleToken.new("CSC6890 Token", "GSU", 18).then((t) => {token = t;})
  • ExampleTokenCrowdsale.new(450, web3.eth.accounts[0], token.address , new web3.BigNumber(web3.toWei(150, 'ether'))).then((t) => {sale = t;})
  • token.transferOwnership(sale.address)

Test transactions:

1. Try to buy tokens with 2.5 ether:

  • sale.buyTokens(web3.eth.accounts[0], {value : new web3.BigNumber(web3.toWei(2.5, 'ether')) , from : web3.eth.accounts[1]})

  • error:minimum contribution is 5 Ether

2. Buy tokens with 15 ether:

  • sale.buyTokens(web3.eth.accounts[0], {value : new web3.BigNumber(web3.toWei(15, 'ether')) , from : web3.eth.accounts[1]})

3. Return how many tokens are left:

  • sale.getTokensLeft().then(result => result.toNumber())

  • result:135000000000000000000

4. Buy tokens (again) with 25 Ether:

  • sale.buyTokens(web3.eth.accounts[0], {value : new web3.BigNumber(web3.toWei(25, 'ether')) , from : web3.eth.accounts[1]})

  • error: 1 purchase per account