USER - prompt user for input.
- $*$USer expression :string
- evaluates the given "expression" to obtain an integer "n".
This should be between 1 and 99.
EXEC then displays the given "string" as a prompt on the terminal.
Finally, it reads a command line argument from the standard input
and uses this input as argument "n" in the argument list.
For example,
$*$user 3 :"Enter your name"
prompts the user with the given string, and treats the
user's reply as argument 3 in the argument list.
The "string" may be omitted, in which case EXEC just reads
the standard input without prompting.
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