# Reader Exercise In this exercise, you'll learn how to read transient storage from the [`PoolManager`](https://github.com/Uniswap/v4-core/blob/main/src/PoolManager.sol) contract. The starter code for this exercise is provided in [`foundry/src/exercises/Reader.sol`](https://github.com/Cyfrin/defi-uniswap-v4/blob/main/foundry/src/exercises/Reader.sol) Solution is in [`foundry/src/solutions/Reader.sol`](https://github.com/Cyfrin/defi-uniswap-v4/blob/main/foundry/src/solutions/Reader.sol) ## Task 1 - Get currency delta ```solidity function getCurrencyDelta(address target, address currency) public view returns (int256 delta) { // Write your code here } ``` Get the currency delta identified by `target` and `currency`. The test will take tokens from the `PoolManager` contract to check the currency delta store in the `PoolManager` with the value returned from your code. ## Test ```shell forge test --fork-url $FORK_URL --match-path test/Reader.test.sol -vvv ```