R language, pause loop and ask user for continue

i have an idea to pause loop at some iteration and ask "user" for some answer.

for example

some_value = 0
some_criteria = 50
for(i in 1:100)
{
  some_value = some_value + i
  if(some_value > some_criteria)
  {
    #Here i need to inform the user that some_value reached some_criteria
    #I also need to ask the user whether s/he wants to continue operations until the loop ends
    #or even set new criteria
  }
}

Again, I want to pause loop, and ask user if he would like to continue like: "Press Y/N"

some_value = 0
some_criteria = 50
continue = FALSE
for(i in 1:100){
  some_value = some_value + i
  print(some_value)
  if(some_value > some_criteria && continue == FALSE){
    #Here i need to infrom user, that some_value reached some_criteria
    print(paste('some_value reached', some_criteria))

    #I also need to ask user whether he wants co countinue operations until loop ends
    #or even set new criteria

    question1 <- readline("Would you like to proceed untill the loop ends? (Y/N)")
    if(regexpr(question1, 'y', ignore.case = TRUE) == 1){
      continue = TRUE
      next
    } else if (regexpr(question1, 'n', ignore.case = TRUE) == 1){
      question2 <- readline("Would you like to set another criteria? (Y/N)")
      if(regexpr(question2, 'y', ignore.case = TRUE) == 1){
        some_criteria <-  readline("Enter the new criteria:")
        continue = FALSE
      } else {
        break  
      }
    }
  }
}