parseInt (solidity

parseInt.sol

// Copyright (c) 2015-2016 Oraclize srl, Thomas Bertani
function parseInt(string _a, uint _b) internal returns (uint) {
  bytes memory bresult = bytes(_a);
  uint mint = 0;
  bool decimals = false;
  for (uint i = 0; i < bresult.length; i++) {
    if ((bresult[i] >= 48) && (bresult[i] <= 57)) {
      if (decimals) {
        if (_b == 0) break;
          else _b--;
      }
      mint *= 10;
      mint += uint(bresult[i]) - 48;
    } else if (bresult[i] == 46) decimals = true;
  }
  return mint;
}