Useless instructions: Difference between revisions

 

=={{header|ALGOL 68}}==

As well as being able to write <code>IF TRUE THEN SKIP ELSE some code that will never be executed FI</code> and <code>WHILE FALSE DO some code that will never be executed OD</code>, as in other languages shown here, Algol 68 has a feature that was presumably intended to aid portability (though whether it does in practice is another matter...):<br>

Algol 68 has a notionally infinite number of integer, real and comples types. THe standard types INT, REAL and COMPL, can have an arbitrary number of LONG or SHORT prefixes to indicate larger or smaller types. Whether these are actually larger or smaller depends on the implementation - no warning is issued (at least, not in Algol 68G) to indicate that e.g. LONG LONG LONG REAL is not longer than LONG LONG REAL. In addition, there are "environment enquiries" that will reveal how big the types are, so e.g. max int is the largest INT value, long max int is the largest LONG INT value, etc. An arbitrary number of long and short prefixes can be applied.<br>

<lang algol68>print( ( long long long max int, newline ) );

print( ( long long max int, newline ) );

{{out}}

<pre>

</pre>

=={{header|AWK}}==

<lang AWK>