pragma solidity ^0.8.3;
import"https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol";

contract MyContract{

    //1st Method of calling solidity library function 
    using SafeMath for uint256;
    function addition(uint256 a, uint256 b) public payable returns (bool,uint256)
    { return a.tryAdd(b);}
    
    //2nd Method of calling solidity library function 
    function multiply(uint256 a, uint256 b) public payable returns (bool,uint256)
    { return SafeMath.tryMul(a,b);}
    
    
}

Here, in this Contract example we have imported openzeppelin SafeMath Library.

In solidity contracts the libraries contain internal functions that means they can be called only within the contract inside a function.

Here also we will see 2 methods of calling library functions

In 1st method we can see that we are passing only one argument inside "tryAdd" library function & the next argument we put at the begining followed by "." .Here solidity by default recognises the library function as we have written "using SafeMath for uint256;".

In 2nd method we can see that we are passing two arguments inside unlike the 1st one since we have written library name "SafeMath" followed by "." . Here no need to write "using SafeMath for uint256;"

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