Data Location Assignment

[lawyer]

changed this:

         User memory user = users[id];
         user.balance = balance;

to this:

         users[id].balance = balance;

and the balance update then worked

[nqb]

pragma solidity 0.7.5;

contract MemoryAndStorage {

mapping(uint => User) users;

struct User{

    uint id;

    uint balance;

}

function addUser(uint id, uint balance) public {

    users[id] = User(id, balance);

}

function updateBalance(uint id, uint balance) public {

     users[id].balance = balance;

            

}

function getBalance(uint id) view public returns (uint) {

    return users[id].balance;

}

}