How can I compile atom code through terminal using truffle? - truffle

Question

I trying to compile my atom code through the Mac terminal and I received this error:
Error parsing /Users/owner/Desktop/contracts/contracts/ApprovalContracts.sol: ParsedContract.sol:6:36: ParserError: Expected primary expression.
address public constant approver = ; ^
Compilation failed. See above.
I need to compile my code from atom using the terminal truffle compile.
Here is the code:
pragma solidity ^0.4.18;
contract ApprovalContracts {
address public sender;
address public receiver;
address public constant approver =;
function deposit(address _receiver) external payable {
require(msg.value > 0);
sender = msg.sender;
receiver = receiver;
}
function viewApprover() external pure return(address) {
return(approver);
}
function approve() external {
require(msg.sender == approver);
receiver.transfer(address(this).balance);
}
}

Answer 1

There are a few problems with your code.
You have to initialize the constant variable approver with a value.
On line 12, the code should be receiver = _receiver;
On line 15, it should be returns(address) instead of return(address)
The final code should be something like this
pragma solidity ^0.4.18;
contract ApprovalContracts {
address public sender;
address public receiver;
address public constant approver=some-address-here-without-quotes;
function deposit(address _receiver) external payable {
require(msg.value > 0);
sender = msg.sender;
receiver = _receiver;
}
function viewApprover() external pure returns(address) {
return(approver);
}
function approve() external {
require(msg.sender == approver);
receiver.transfer(address(this).balance);
}
}