Parse an Integer to a String in Solidity?

Question

How can I parse an integer (uint) to a string in solidity?

This is what I have attempted to do so far:

function bytes32ToString (bytes32 data) returns (string) {
    bytes memory bytesString = new bytes(32);
    for (uint j=0; j<32; j++) {
      byte char = byte(bytes32(uint(data) * 2 ** (8 * j)));
      if (char != 0) {
        bytesString[j] = char;
      }
    }
    return string(bytesString);
  }

But the following line returns an error:

string myString= bytes32ToString(bytes32(myInteger));

Type string memory is not implicitly convertible to expected type string storage pointer.

Why is this?

I am getting an error with that code. I have updated my question with the details. — Pabi, Dec 20 '16 at 18:10

Badr Bellaj · Accepted Answer · 2016-12-20T22:01:34.163

2

try this code :

function bytes32ToString (bytes32 data) returns (string) {
    bytes memory bytesString = new bytes(32);
    for (uint j=0; j<32; j++) {
      byte char = byte(bytes32(uint(data) * 2 ** (8 * j)));
      if (char != 0) {
        bytesString[j] = char;
      }
    }

    return string(bytesString);
  }

   function My_integ(bytes32 myInteger) returns (string){

        string memory myString= bytes32ToString( myInteger );
return myString;
   }

edited Dec 20 '16 at 22:01

answered Dec 20 '16 at 18:27

Badr Bellaj

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1

Still get the same error – Pabi Dec 20 '16 at 21:14
1

@Pabi what error ? – Teleporting Goat Dec 20 '16 at 21:32
1

it works for me perfectly check the pic in the answer. you resolve the error using memory keyword – Badr Bellaj Dec 20 '16 at 22:01

score 1 · Answer 2 · answered Mar 16 '17 at 08:41

Try this. It works.

pragma solidity ^0.4.2;
contract UintToStr {  
     function UintToString(uint v) constant returns (string) {
          bytes32 ret;
            if (v == 0) {
                 ret = '0';
            }
            else {
                 while (v > 0) {
                      ret = bytes32(uint(ret) / (2 ** 8));
                      ret |= bytes32(((v % 10) + 48) * 2 ** (8 * 31));
                      v /= 10;
                 }
            }

            bytes memory bytesString = new bytes(32);
            for (uint j=0; j<32; j++) {
                 byte char = byte(bytes32(uint(ret) * 2 ** (8 * j)));
                 if (char != 0) {
                      bytesString[j] = char;
                 }
            }

            return string(bytesString);
      }
}

score 0 · Answer 3 · answered Jan 06 '22 at 18:59

0

There is an import of a library that makes it possible with a int-to-string function, taken from How to convert uint to string in solidity?.

solidity ^0.8.0
import "@openzeppelin/contracts/utils/Strings.sol";
Strings.toString(myUINT)

answered Jan 06 '22 at 18:59

questionto42

111
5

Parse an Integer to a String in Solidity?

3 Answers3