The 'destination' must be a file pointer, a stream, NIL [to create a string] or T [to print to *standard-output*].
The 'format' function prints the specified expressions [if any] to the
specified 'destination' using the 'format' string to control the print
format. If the 'destination' is
(format T "Now is the time for") ; prints Now is the time for (format T "all ~A ~S to" 'good 'men) ; prints all GOOD MEN to (format T "come to the") ; prints come to the (format T "~A of their ~S" ; prints aid of their "party" "aid" "party") (format *standard-ouput* "Hello there") ; prints Hello there (format nil "ho ho ~S" 'ho) ; returns "ho ho HO" (format T "this is ~%a break") ; prints this is ; a break (format T "this is a long ~ string") ; prints this is a long string
Supported format directives: The 'format' string in XLISP supports the following format directives:
||ASCII, prints the 'expr'. If it is a string print it without quotes. This is like the princ function.|
||s-expr, prints the 'expr'. If it is a string print it with quotes. This is like the prin1 function.|
||prints a 'newline' control character.|
||prints a single tilde '~' character.|
||continue the 'format' string on the next line. This signals a line break in the format. The 'format' function will ignore all white-space [blanks, tabs, newlines]. This is useful when the 'format' string is longer than a program line. Note that the 'newline' character must immediately follow the tilde character.|
Common Lisp: The 'format' function in Common Lisp is quite impressive. It includes 26 different formatting directives. XLISP, as shown above, does not include most of these. The more difficult ones that you might encounter are the decimal, octal, hexidecimal, fixed-format floating-point and exponential floating-point. It is possible to print in octal and hexadecimal notation by setting *integer-format*. It is possible to print in fixed format and exponential by setting *float-format*. However, neither of these system variables are supported in Common Lisp and neither gives control over field size.
function in the