readline reads a line from the terminal (in interactive use).
readline(prompt = "")the string printed when prompting the user for input.
Should usually end with a space " ".
A character vector of length one. Both leading and trailing spaces and tabs are stripped from the result.
In non-interactive use the result is as if the response was
RETURN and the value is "".
The prompt string will be truncated to a maximum allowed length, normally 256 chars (but can be changed in the source code).
This can only be used in an interactive session.
readLines for reading text lines from connections,
including files.
# NOT RUN {
fun <- function() {
ANSWER <- readline("Are you a satisfied R user? ")
## a better version would check the answer less cursorily, and
## perhaps re-prompt
if (substr(ANSWER, 1, 1) == "n")
cat("This is impossible. YOU LIED!\n")
else
cat("I knew it.\n")
}
if(interactive()) fun()
# }