Solidity also supports enums. Here is an example that shows enum syntaxes:

contract sample { 

    //The integer type which can hold all enum values and is the smallest is chosen to hold enum values 
    enum OS { Windows, Linux, OSX, UNIX } 

    OS choice; 

    function sample(OS chosen){ 
        choice = chosen; 
    } 

    function setLinuxOS(){ 
        choice = OS.Linux; 
    } 

    function getChoice() returns (OS chosenOS){ 
        return choice; 
    } 
}