Create a contract on the test net

1. download Misc from [https://github.com/ethereum/mist/releases]
2. Install Misc and start the application. Quit sync by clicking "Launch Application"
3. Connect to Test-Net via Menü->Entwicklung->Netzwerk->Rinkeby Test-Netzwerk
4. Click on search button on the left (Browser within the Misc app) and open [https://faucet.rinkeby.io/]
5. get some ether via twitter: see https://www.youtube.com/watch?v=DEULs3ShTxo
6. Now you have ether and can create contracts on the test net.
7. open IDE using Menü->Entwicklung->Remix IDE öffnen

Solidity

• Best practice https://github.com/ConsenSys/smart-contract-best-practices/#circuit-breakers-pause-contract-functionality

• GAS https://ethereum.stackexchange.com/questions/18778/gas-cost-of-different-computations

• functions http://solidity.readthedocs.io/en/develop/contracts.html?highlight=pure#functions

• constant is an alias to view.

• public vs external https://ethereum.stackexchange.com/questions/19380/external-vs-public-best-practices?answertab=active#tab-top

• modifier or require https://ethereum.stackexchange.com/questions/29867/using-require-or-modifier

• modifier as interceptor https://blog.colony.io/how-to-write-clean-elegant-solidity-code-using-function-modifiers-ba55fb366a92

    modifier ... {
     StartEvent(...)
     -;
     EndEvent(...)
    }

• throw exception in modifier (yes/no) https://ethereum.stackexchange.com/questions/8436/why-use-throw-in-modifiers-instead-of-conditional-entrance https://blog.colony.io/how-to-write-clean-elegant-solidity-code-using-function-modifiers-ba55fb366a92

    modifier ... {
     if(...) throw
     _;
    }
    modifier ... {
     if(...) _;
    }
    modifier ... {
     require()
     _;
    }

• variables Info: address(0) is the same as "0x0", an uninitialized address.

• Units and Globally Available Variables http://solidity.readthedocs.io/en/v0.4.21/units-and-global-variables.html

• visibility-and-getters http://solidity.readthedocs.io/en/develop/contracts.html#visibility-and-getters