Eng:C Block

A C block is a block that is shaped like a "C", so other blocks can fit inside it. These blocks perform the conditions and loops.

Shape
C blocks have a "mouth" (it looks like the letter "C", hence the name) the blocks that will be played with the C block go in these mouths. All but one of the C blocks consist of one mouth the other, If  Then, Else, consists of two mouths. When any of the other C blocks are dragged over a stack of blocks if the C is empty  its mouth extends to wrap around them.

repeat (10) repeat until <(loudness) > [30]> glide (1) secs to x: (10) y: (0) wait (1) secs go to x: (0) y: (0) end play sound [meow v] until done end

In 1.2.1 and earlier, C-block scripts could only be built one block at a time.

Blocks
In Scratch 2.0, there are five C blocks, and they can all be found in the Control category.


 * Forever
 * Repeat
 * If Then
 * If Then, Else
 * Repeat Until

In Scratch 1.4 and earlier, there was also a block. It was replaced with its workaround. forever if <> then

Uses
As C blocks are for checks and loops, they are used almost everywhere. Some uses include:
 * Things that must go on forever

when gf clicked forever turn cw (15) degrees


 * Checking a condition

when [space v] key pressed if <(loudness) > [30]> then stop [all v] end


 * Repeating an animation a certain amount of times

when gf clicked repeat (200) turn ccw (36) degrees change [color v] effect by (1) end

Here is an example for both checks and looping:

when I receive [Decrease health v] change [Health v] by (-1) if <(health) = [0]> then repeat (8) change [color v] effect by (25) end end

when gf clicked if then stop [all v] else end There is a check (the If Then block is checking if the variable Health has a value of 0), and inside the check is a repeat loop (with the Repeat  block). Note how C blocks can be placed inside other C blocks.
 * Starting/Stopping

Blockform = Klammer-Blöcke