Solidity – Issue in Explicit Type Conversion from uint256 to bytes1

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I am trying to convert the unit to string using the method. I have the "TypeError" in the line. Please check the screen shot below for the error message.

function uint2str(uint i) internal pure returns (string memory) {
    if (i == 0) return "0";
    uint j = i;
    uint length;
    while (j != 0) {
        length++;
        j /= 10;
    }
    bytes memory bstr = new bytes(length);
    uint k = length - 1;
    while (i != 0) {
        bstr[k--] = byte(48 + i % 10);   ----> this is the place I get error
        i /= 10;
    }
    return string(bstr);
}

Best Answer

Change your error statement to this :

bstr[k--] = byte(uint8(48 + i % 10));

It will work because of same bit length of both types.

Related Solutions

Solidity Data Conversion – Solidity Data Type Conversion from Bytes to Address/String/Uint/Int: Any Library Available?

https://solidity.readthedocs.io/en/v0.5.2/types.html?highlight=bytes#dynamically-sized-byte-array

Bytes is a not a value type according to the docs, and is actually a dynamically-sized array.

This library can convert uint to Bytes32 and vice-versa, if that helps any.

Fixing Invalid Implicit Conversion Errors from uint256 to bytes in Solidity

You are getting this error because you are trying to take the keccack256 hash of a uint, which you cannot do, according to the docs. What you must do instead is convert the uint to a bytes.

The code you want is as follows:

function random() private returns(uint){
    uint source = block.difficulty + now;
    bytes memory source_b = toBytes(source);
    return uint(keccak256(source_b));
}

function toBytes(uint256 x) public returns (bytes memory b) {
    b = new bytes(32);
    assembly { mstore(add(b, 32), x) }
}

Best Answer

Related Solutions

Solidity Data Conversion – Solidity Data Type Conversion from Bytes to Address/String/Uint/Int: Any Library Available?

Fixing Invalid Implicit Conversion Errors from uint256 to bytes in Solidity

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