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(defparameter *result* (lookup *index* *query*))
(format t "Result for query ~s: ~{~a~^, ~}~%" *query* *result*)</lang>
=={{header|D}}==
<lang d>import std.stdio, std.algorithm, std.file, std.string;
void parseFile(in string fn, ref string[][string] idx) {
if (!exists(fn) || !isFile(fn))
throw new Exception("File not found");
foreach (word; readText(fn).splitter()) {
if (word in idx) {
if (canFind(idx[word], fn))
continue;
}
idx[word] ~= fn;
}
}
void main() {
string[][string] index;
auto filenames = ["a.txt", "b.txt", "c.txt"];
foreach (fname; filenames)
parseFile(fname, index);
while (true) {
writef("\nEnter a word to search for: (q to quit): ");
auto w = readln().strip();
if (w.toLower() == "q") {
writeln("quitting");
break;
}
if (w in index)
writefln("'%s' found in%( %)", w, index[w]);
else
writefln("'%s' not found", w);
}
}</lang>
<pre>Enter a word to search for: (q to quit): cat
'cat' not found
Enter a word to search for: (q to quit): dog
'dog' not found
Enter a word to search for: (q to quit): five
'five' found in "b.txt"
Enter a word to search for: (q to quit): one
'one' found in "a.txt" "c.txt"
Enter a word to search for: (q to quit): seven
'seven' found in "c.txt"
Enter a word to search for: (q to quit): q
quitting</pre>
=={{header|Factor}}==
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