What is the correct way to ask for user input in an R program?

Question

The my program below(which is in two parts) works if I run them separately – that is, if I paste the first part into the R Console, run it and then paste the second and ru

Answer 1

It's because when you copy and paste all then scan reads pasted lines as input.

If you copy this tree lines to console

x <- scan(nmax=1)
1
2

x become 1, scan don't wait for your interaction cause it got line to read.

You have to wrap everything in {}:

{
 x <- scan(nmax=1)
 1
 2
}

You have to wrap both parts of your program. To be more clear: when you paste your code to console } should be last sign.