If
Syntax
| Syntax legend | |
|---|---|
| < ... > | item |
| [ ... ] | optional |
| ( ... ) * | 0 or more times |
| ( ... ) + | 1 or more times |
IF ( <condition> )
- [ <code> ]
( ELSEIF ( <condition> )
- [ <code> ] ) *
[ ELSE
- [ <code> ] ]
END
Description
If statements are used to control the flow of your program by means of checking conditions.
if( <condition1> )
// code1
elseif( <condition2> )
// code2
elseif( <condition3> )
// code3
else
// code4
end
// code5
If at the time the program reaches this if-codeblock condition1 is true, then code1 will be executed and then code5. If condition1 is false, the program will go to the next elseif or and check if that is true or false: if condition2 is true, code2 and then code5 is executed. If condition2 is false, the program will check the next elseif and do the same thing over, until the program reaches the else or the end. If an else is present, the code in the else-block will thus be executed when all other conditions are false.
Example
Execute function
This is a little example of how to make a function perform a certain task depending on a command.
Function int execute(String command, int* params)
Begin
if( command == "SEND" )
NET_Send(atoi(params[0]),params[1]);
elseif( command == "RECV" )
NET_Recv(atoi(params[0]));
elseif( command == "INIT" )
NET_Init(atoi(params[0]),atoi(params[1]),atoi(params[2]));
elseif( command == "QUIT" )
NET_Quit();
else
// error: command unknown
return -1;
end
return 0;
End
Movement
Movement with Ifs.
Loop
if(key(_up)) y-=5; end
if(key(_down)) y+=5; end
if(key(_left)) x-=5; end
if(key(_right)) x+=5; end
End
Of course, this is faster:
Loop
y += 5 * (key(_down )-key(_up ));
x += 5 * (key(_right)-key(_left));
End