Hey, I am working on a project in which the sprite asks the user to input something and it checks whether it contains letters, as it should only have numbers. I know we can use the

<<> or <>>

block but it would take a lot of space, any ideas?

It's easier to check if the input is not a number.

You can check if it is a number with something like this:

<((var) + (0)) = (var)> // true if var is a number

The addition block converts the variable into a number and compares it with what it was before. Numbers remain the same because 0 was added. Strings however are converted to the number 0 which is no longer the original string and returns false. Note that the string “0” as well as any other string representing a number will be seen as a number, but this is fine and intended with how Scratch handles data types.

awesome-llama wrote:

It's easier to check if the input is not a number.

You can check if it is a number with something like this:

<((var) + (0)) = (var)> // true if var is a number

The addition block converts the variable into a number and compares it with what it was before. Numbers remain the same because 0 was added. Strings however are converted to the number 0 which is no longer the original string and returns false. Note that the string “0” as well as any other string representing a number will be seen as a number, but this is fine and intended with how Scratch handles data types.

Yeah, but it doesn't report correctly if the answer contains both letters and numbers.

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I'll create a project for it, you just need to use the code i use and implement it
I'll put it in once it is done
https://scratch.mit.edu/projects/989808240
tell me if i made a mistake