Ethereum linking library with contract not working as accepted...returning any state variable returns just the default value

Question

my library

pragma solidity ^0.5.8;

library SafeMath {

    function add(uint256 a,uint256 b) public pure returns (uint256) {
        return a+b;
    }
}

My contract

pragma solidity ^0.5.8;

import "./SafeMath.sol";

contract Test {

using SafeMath for uint256;

uint256 c = 10;

    function addition() public {
        uint256 a = 10;
        uint256 b = 10;
        c = a.add(b);
    }

    function getValue() view public returns (uint256) {
        return c;
    }

}

THE STEPS I AM FOLLOWING ARE:-

step 1 :- I am compiling SafeMath.sol using commnadline [solc --abi --bin safeMath.sol ]

step 2 :- I am deploying the same with web3 and getting the address as 0x785763........

step3 :- I am linking and compiling the Test.sol contract using the command solc --abi --bin Test.sol --libraries SafeMath:0x785763........ -o bin

step4 :- I am deploying this contract and trying to just get the value of c without performing the addition operation ,i am getting default value 0

also no events gets fired in addition method inside contract(not shown in this code)

//--------------------------------------------------- //MY WEB3 CODE

var UserRepositoryInstance1 = web3.eth.contract(UserRepositoryABI1).at(UserRepositoryAddress1);

app.get('/checkAdd', function (req, res) { web3.eth.defaultAccount = web3.eth.coinbase; var i=UserRepositoryInstance1.getValue(); console.log(i) })

ANY HELP WOULD BE APPRECIATED THANK YOU.

Answer 1

Try to add this --link before --libraries, and see this answer it could help you

What are the steps to compile and deploy a library in Solidity?