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You can't override build in types in solidity. They are not contracts and you can override only contracts. An address is an EVM type and send is a wrapper around the CALL Opcode. http://solidity.read …

When you instantiate a contract with its address as parameter, then you have access to this very contract: contract C1 { function call (address myContractsAddress, uint aParameter) returns(uint){ …

My contract should have a function that reads the creation date of the sender address. Possible?

It is rather easy I think, even with solidity contract Example{ address recipient = 0x0000cafebabe; function send(){ recipient.send(this.balance); } } results in (optimized bytecode): 60606 …

The main purpose of any Proof of ... system is to pick a random node to confirm that nobody cheated in the last block(s). And it does so in a decentralized way, i.e. no central random generator. L …

Functions: the default is public State variables: the default is internal You can find more here: http://solidity.readthedocs.io/en/latest/contracts.html

Push is available only on storage arrays, that is member/ state variables and not in memory arrays, that is local variables: push: Dynamic storage arrays and bytes (not string) have a member fun …

Is owner > 0x0 a good way to test if an address owner was set in Solidity? I am not sure if this could break something in the future and if there are better ways to see if the address was set. What is …

Yes everything gets cleared Given this contract: contract C { struct Point { uint256 x; uint256 y; } struct Image { Point[] points; string name; } …

I've executed your contract with public on browser-solidity and had no errors. You should check if your tools are up to date...

How would I verify that condition [...]? Oracles for external data, calling Contracts for internal stuff would that be asynchronous in any way? Not sure, asking here In the case of a ti …

If you think about it, the library can not know the variable names of the calling contract. The compiler must fail. What you can do is pass the variable through the interface. In the background, no tr …

In which functions do I need a transaction? Only in that that changes values. The other you can call from a single ethereum node. This does not require spending any any ETH. From the web3 documentat …

There is jobs.ethercasts.com Or use a freelancer portal like upwork.com Or you can contact me via a temporary email to discuss your project: [email protected]

Assume a contract: contract A { function b() constant returns (uint8 result) { result =1; } } When I replace uint8 result with uint256 result then the creation of the contract get …