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Revision as of 12:31, 9 November 2007 (edit) Sandman (Talk | contribs) (New page: category:reserved category:language category:control flow statements '''Up to Control Flow Statements''' ---- == Definition == '''IF''' ( <cond...) ← Previous diff		Current revision (12:43, 9 November 2007) (edit) (undo) Sandman (Talk | contribs) m
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	[[Control flow statements|'''Up to Control Flow Statements''']]		[[Control flow statements|'''Up to Control Flow Statements''']]
	----		----
-
	== Definition ==		== Definition ==
-	'''IF''' ( <condition> )	+	'''IF''' ( <condition> )<br>
-	<code>	+	<nowiki><code></nowiki><br>
-	['''ELSEIF''' ( <condition> )	+	['''ELSEIF''' ( <condition> )<br>
-	<code>]	+	<nowiki><code></nowiki>]<br>
-	['''ELSE'''	+	['''ELSE'''<br>
-	<code>]	+	<nowiki><code></nowiki>]<br>
	'''END'''		'''END'''
-	'''If''' statements are used to control the flow of your program by means of checking a condition.	+	'''If''' statements are used to control the flow of your program by means of checking conditions.
	<pre>		<pre>

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Current revision

Up to Control Flow Statements

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Contents 1 Definition 2 Example 2.1 Execute function 2.2 Movement

[edit] Definition

IF ( <condition> )
<code>
[ELSEIF ( <condition> )
<code>]
[ELSE
<code>]
END

If statements are used to control the flow of your program by means of checking conditions.

if( <condition1> )
    // code1
elseif( <condition2> )
    // code2
else
    // code3
end
// code4

If at the time the program reaches this if-codeblock condition1 is true, then code1 will be executed and then code4. 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 code4 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.

[edit] Example

[edit] 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

[edit] 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