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I am learning to develop smart contract using Solidity. Currently, I am working and test the feature of following crowdsale contract.

https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v1.8.0/contracts/crowdsale/Crowdsale.sol

This contract constructor has three different values.

  1. rate
  2. wallet address
  3. token address

I am confused about the first one that is "rate". what value should i have to pass here ?

for example, I want to sell 1 token at cost of 1 ether then what should i pass here ?

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As you can see the function

function _getTokenAmount(uint256 _weiAmount) internal view returns (uint256) {
    return _weiAmount.mul(rate);
  }

It states that for 1 wei, the no of tokens will be 1*rate.

for example, I want to sell 1 token at cost of 1 ether then what should i pass here ?

This depends on number of decimals in your toke contract. For eg, if you have 18 decimals,then

token = wei * rate

1 Token = 1 ether * rate

10 ^18 token = 10 ^18 wei * rate

=> rate = 1
  • I have deployed the crowdsale contract with my fixed supply token but it gives an exection. – Sandeep Jun 22 '18 at 7:29
  • my fixed supply has 18 decimal – Sandeep Jun 22 '18 at 7:30
  • exception is constructor should be payable if you send the value – Sandeep Jun 22 '18 at 7:31
  • You need to make any function that accepts ether payable – Prashant Prabhakar Singh Jun 22 '18 at 10:58
  • you can see in my crowdsale contract there is a function name buyTokens() that is payable. – Sandeep Jun 23 '18 at 5:24
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http://eth-converter.com/

Wei to Ether

Wei is the 18 digits that go into an Ether

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