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global time, date, save, wombats
# All variables passed to echo() must be:
# Simple scalar variables, because echo() does not yet understand
# Icon keywords (such as &clock), arrays, records, or function
# calls. However, such entities may be assigned to simple global
# variables, as the main program below shows; and
# Global, because echo() cannot accesss their values otherwise.
# If a variable is undefined or null, echo() outputs nothing.
link echo
procedure main()
time := "12:34:56" # fake &clock for reproducible test
date := "2010/02/30" # fake &date for reproducible test
save := 47.23
wombats := 22
# Usage method 1:
"It is now $time on $date and you have savings of $$$save." ? echo()
"The number of wombats is $wombats." ? echo()
"It is now ${time} on ${date} and you have ${wombats} wombats." ? echo()
"There is no global variable named \"$foo\"." ? echo()
"This does not work: It is now ${&clock}." ? echo()
echo()
"The previous echo() example printed an empty line." ? echo()
echo()
"Here is another way to use echo()..." ? echo()
echo()
# Usage method 2:
"It is now $time on $date and you have savings of $$$save." |
"The number of wombats is $wombats." |
"It is now ${time} on ${date} and you have ${wombats} wombats." |
"There is no global variable named \"$foo\"." |
"This does not work: It is now ${&clock}." |
"" |
"The previous input line printed an empty output line." ? echo()
# The value of &subject defaults to "", so echo() will print out an
# empty line if it is called without a `?'.
echo()
# The next test takes advantage of the fact that string
# concatenation has a higher precedence than alternation. It
# prints three lines:
"Fee, " ||
"fi, " ||
"fo, " ||
"fum, " | # 1st line
"I " ||
"smell " ||
"the blood " | # 2nd line
"of an Englishman!" ? echo() #3rd line
end
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