erc20-totalSupply.sol

contract MyERCToken {
  // In this case, the total supply
  // of MyERCToken is fixed, but
  // it can very much be changed
  uint256 _totalSupply = 1000000;
  
  function totalSupply() constant returns (uint256 theTotalSupply) {
    // Because our function signature
    // states that the returning variable
    // is "theTotalSupply", we'll just set that variable
    // to the value of the instance variable "_totalSupply"
    // and return it
    theTotalSupply = _totalSupply;
    return theTotalSupply;
  }
}