[Ethereum] Operator & not compatible with types bytes32 and int_const

soliditytruffle

i have the code below:

    uint256 lastBlockNumber = block.number - 1;
    bytes32 hashVal = bytes32(block.blockhash(lastBlockNumber));
    bytes5 _byteData = bytes5((hashVal & 0xffffffff) << 216);

the last line bytes5((hasVal & 0xffffffff) << 216); was working perfectly with solidity 0.4.18 but once i am trying it with 0.5.2 its not working i am getting the error below:

Operator & not compatible with types bytes32 and int_const 4294967295

i am not able to resolve this, any idea on how to resolve it? thank you

Best Answer

i have found the solution below and it worked

    uint256 lastBlockNumber = block.number - 1;
    bytes32 hashVal = bytes32(blockhash(lastBlockNumber));
    bytes5 _byteData = bytes5((hashVal & bytes32(0xffffffff)) << 216);

Related Solutions

Solidity Error – Operator ‘==’ Not Compatible with Types Address and Bytes32

you are comparing data types of address and bytes32 for equality. Since they are two data types operator is not allowed. you need make either student to bytes32 or fName to address depending on your use-case.

solidity – Solving TypeError: Operator >= Not Compatible with Types bytes1 and int_const 37

There's a few solutions for this:

If c needs to be a byte, you can use hexadecimal notation, e.g. c >= 0x25 && c <= 0x25 (or c == 0x25).
Otherwise, you can simply cast the type from byte to uint8 (which is essentially the same type, since both consist of 8 bits):
```
uint8 c = uint8(bytes(input)[i]);

// ...
function s1(uint8 c) internal pure returns (uint) { ... }
```

Note that c == 37 is the same as c >= 37 && c <= 37, so you can simplify your functions like this:

function s1(uint8 c) internal pure returns (uint) {
  if (c == 37 || c == 43 || c == 45 || c == 46 || ...) {
    return 2;
  }

  return 0;
}

Best Answer

Related Solutions

Solidity Error – Operator ‘==’ Not Compatible with Types Address and Bytes32

solidity – Solving TypeError: Operator >= Not Compatible with Types bytes1 and int_const 37

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