delegatecall.sol

pragma solidity ^0.4.24;

contract D {
    function callSetN(address _e, uint _n) public {
        _e.call.value(10).gas(6712353)(bytes4(keccak256("setN(uint256)")), _n);
        // E's storage is set, D is not modified
    }

    function callcodeSetN(address _e, uint _n) public {
        _e.callcode.value(10).gas(6712353)(bytes4(keccak256("setN(uint256)")), _n);
        // D's storage is set, E is not modified
    }

    function delegatecallSetN(address _e, uint _n) public {
        _e.delegatecall.gas(6712353)(bytes4(keccak256("setN(uint256)")), _n);
        // D's storage is set, E is not modified
    }
}

contract E {
    uint public n;
    address public sender;
    uint256 public amount;

    function setN(uint _n) {
        n = _n;
        sender = msg.sender;
        amount = msg.value;
    }
}