From Test-Scratch-Wiki

Round () | |

Category |
Operator |

Type |
Reporter |

The **Round ()** block is an Operators block and a Reporter block. The block rounds the given number to the nearest integer. It follows the standard rules of rounding; decimals that are .5 or higher are rounded up, whereas decimals less than .5 are rounded down.

## Example Uses

In projects that handle decimal numbers, they may have to be rounded—this block will do the job.

Some common uses for the Round () block are below:

- Calculators that will let users round numbers

define calculate if <(operator) = [addition]> set [answer v] to ((value1) + (value2)) end if <(operator) = [round]> set [answer v] to (round (value)) end ... when this sprite clicked //calculator equivalent to the "=" button calculate

- Checking if numbers are approximately equal to each other

set [close? v] to <([abs v] of ((round (value1)) - (round (value2)))) < (2)> //one of many methods

- Rounding a score to the nearest whole number in games

set [score v] to (round (score))

- Removing the decimal from a score, without rounding up

set [score v] to (round ((score) - (0.5)))//any number minus 0.5 will round to the lower integer

- Rounding the value to be put in the Repeat () block, since the value must be a whole number

repeat (round (2.3840462816)) ... end

- Positioning the cursor in tile-based games such as Minesweeper
- Snapping to a grid

when gf clicked forever go to x: ((round ((mouse x) / (25))) * (25)) y: ((round ((mouse y) / (25))) * (25))

## Workaround

*Main article: List of Block Workarounds*

One can use the "Ceil" and "Floor" operations in Scratch 2.0 to accurately round a number:

([floor v] of ((number) + (0.5))) //round a number

The mathematical functions "floor" and "ceiling" can also be replicated using modular arithmetic:

((number) - ((number) mod (1))) //round down (floor) ((number) + ((1) - ((number) mod (1)))) //round up (ceiling)

or

if <(n) > (0)> then set [rounded v] to (((n) + (0.5)) - (((n) + (0.5)) mod (1))) else set [rounded v] to ((((n) - (0.5)) - (((n) - (0.5)) mod (1))) + (1)) end

Another way to replicate the block is to use the letter () of () and join () () operator blocks.

set [report v] to [ ] set [count v] to [0] repeat until <<(letter (count) of (num)) = [.]> or <(count) = (length of (num))>> set [report v] to (join (report) (letter (count) of (num))) change [count v] by (1) end if <<(letter (count) of (num)) = [.]> and <(letter ((count) + (1)) of (num)) > [4]>> then change [report v] by (1) end

## Suggestions

Some Scratchers want a reporter block which rounds to a certain number-place. The block would make all of the above uses more accurate. It would look like this:

`<round (number) to the nearest (base) // category=operators`

It can be replicated by shifting the number over (multiplying or dividing by 10), rounding, and then reversing the original operation.

((round ((number) * ([10^ v] of (number of places)))) / ([10^ v] of (number of places)))

or even this:

((round ((round what) / (to the nearest))) * (to the nearest))

Some Scratchers had suggested to update the (round ()) block as a function.^{[1]} It would look like this:

([round v] of ())

## References

() + ()
• () - () • () * () • () / () • Pick Random () to () • () < () • () = () • () > () • () and () • () or () • Not () • Join ()() • Letter () of () • Length of () • () Mod () • Round () • () of ()More blocks... |