# examples.m4

define(`GREETING', `Hello, World!')dnl
GREETING

define(`SQUARE', `(($1) * ($1))')dnl
SQUARE(5)

define(`DEBUG', `1')dnl
ifdef(`DEBUG', `Debugging is ON', `Debugging is OFF')

define(`DOUBLE', `eval(($1) * 2)')dnl
DOUBLE(7)

define(`FACT',
  `ifelse($1, 0, 1, `eval($1 * FACT(eval($1-1)))')')dnl
FACT(5)

define(`forloop',
  `ifelse($2, $3, `$4',
    `$4`'define(`$1', eval(($2)+1))`'forloop(`$1', eval(($2)+1), $3, `$4')')')dnl
define(`i', 1)dnl
forloop(`i', 1, 5, `Item i
')