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CallerSample.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract Storage {
    uint256 number;
    
    function store(uint256 num) public {
        number = num;
    }

    function retrieve() public view returns (uint256){
        return number;
    }
}

contract Caller {
    Storage storageContract;
    uint256 copied;

    constructor(address storage_addr) {
        storageContract = Storage(storage_addr);
    }

    function copyFrom() public {
        copied = storageContract.retrieve();
    }

    function getCopyNum() public view returns(uint) {
        return copied;
    }
    
    function getNumAt(address storage_addr) public view returns(uint) {
        Storage s = Storage(storage_addr);
        return s.retrieve();
    }
}