How to get a user input in command prompt and pass it to R

Question

I am trying to use

var <- as.numeric(readline(prompt="Enter a number: "))

and later use this in a calculation.

It works fine when running in RStudio but I need to be able to pass this input from the command line in Windows 10 I am using a batch file with a single line

Rscript.exe "C:\My Files\R_scripts\my_script.R"

When it gets to the user input part it freezes and it doesn't provide expected output.