1

Compiling is failing.

vi contracts/MyCoin.sol:

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/token/ERC20/StandardToken.sol';

contract MyCoin is StandardToken {
  string public name = "MyCoin";
  string public symbol = "MC";
  uint public decimals = 2;
  uint public INITIAL_SUPPLY = 10000 * (10 ** decimals);

  function MyCoin() public {
    totalSupply = INITIAL_SUPPLY;
    balances[msg.sender] = INITIAL_SUPPLY;
  }
}

When I run truffle compile:

➜  my-coin truffle compile  
Compiling ./contracts/MyCoin.sol...
Compiling zeppelin-solidity/contracts/math/SafeMath.sol...
Compiling zeppelin-solidity/contracts/token/ERC20/BasicToken.sol...
Compiling zeppelin-solidity/contracts/token/ERC20/ERC20.sol...
Compiling zeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol...
Compiling zeppelin-solidity/contracts/token/ERC20/StandardToken.sol...

/Users/pedro/src/my-coin/contracts/MyCoin.sol:13:5: TypeError: No matching declaration found after variable lookup.
    totalSupply = INITIAL_SUPPLY;
    ^---------^
Compilation failed. See above.
4

OZ has updated their code besides restructuring some of the folders.

Old Answer (pre 2.X.X release)

Look here: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/ERC20/BasicToken.sol

Your direct answer: totalSupply_ (the underscore) is the variable name you're looking for.

Current Answer Update (12/11/18):

uint256 private _totalSupply;

/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
    return _totalSupply;
}

New Link: https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v2.0.0/contracts/token/ERC20/ERC20.sol

OZ has refactored their repo ever since v2.X.X release

1

Total supply variable is defined as a function. Modify your code

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/token/ERC20/StandardToken.sol';

contract MyCoin is StandardToken {
  string public name = "MyCoin";
  string public symbol = "MC";
  uint public decimals = 2;
  uint public INITIAL_SUPPLY = 10000 * (10 ** decimals);

  function MyCoin() public {
    totalSupply_ = INITIAL_SUPPLY;
    balances[msg.sender] = INITIAL_SUPPLY;
  }
}

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