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The code snippet I have included Converts an ASCII string value into an uint as long as the string itself is a valid unsigned integer and I am getting errors on line "assert(uint8(_bytesValue[i]) >= 48 && uint8(_bytesValue[i]) <= 57);" and on line "_ret += (uint8(_bytesValue[i]) - 48)*j;" as given in the screenshot of the code.

function parseInt(string memory _value) 
    public
    returns (uint _ret) {
    bytes memory _bytesValue = bytes(_value);
    uint j = 1;
    for(uint i = _bytesValue.length-1; i >= 0 && i < _bytesValue.length; i--) 
    {
        assert(uint8(_bytesValue[i]) >= 48 && uint8(_bytesValue[i]) <= 57);
        _ret += (uint8(_bytesValue[i]) - 48)*j;
        j*=10;
    }
}
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  • 3
    Please share your code and the errors you get (not a screenshot). – user19510 Mar 9 '19 at 8:00
  • Ok... i have edited the body... please look at it – PREETAM Mar 11 '19 at 6:40
2

You can cast a bytes1 to a uint8 and then compare. For example:

bytes memory _bytesValue = bytes('yo yo');
assert(uint8(_bytesValue[2]) >= 4);
uint _ret = uint8(_bytesValue[2]) - 4;
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  • It solved the errors... Thank you so much... – PREETAM Mar 11 '19 at 6:41
  • You should probably choose this answer then. – Mikhail Vladimirov Mar 27 '19 at 11:18
  • There is no byte1 type in Solidity. It is named bytes1. – Mikhail Vladimirov Mar 27 '19 at 11:20
  • ^ fixed, thanks – Hardly Difficult Mar 28 '19 at 18:47
1

When reading one element from a bytes, you get a bytes1.

You should probably cast your bytes1 to a uint8

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