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<div><h1 id="a0000000102">1.26 if</h1>
<p><a name="a0000001053" id="a0000001053"></a><a name="a0000001054" id="a0000001054"></a><a name="a0000001055" id="a0000001055"></a> </p><pre>
if <criterion>
"{"
...
"}" { else if <criterion>
"{"
...
"}" } [ else
"{"
...
"}" ]
</pre><p>The <tt class="tt">if</tt> command<a name="a0000001056" id="a0000001056"></a> allows conditional execution of blocks of commands. The code enclosed in braces following the <tt class="tt">if</tt> statement is executed if, and only if, the <tt class="tt">criterion</tt> is satisfied. An arbitrary number of subsequent <tt class="tt">else if</tt> statements can optionally follow the initial <tt class="tt">if</tt> statement; these have their own criteria for execution which are only considered if all of the previous criteria have tested false – i.e. if none of the previous command blocks have been executed. A final optional <tt class="tt">else</tt> statement can be provided; the block of commands which follows it are executed only if none of the preceding criteria have tested true. The following example illustrates a chain of <tt class="tt">else if</tt> clauses: </p><pre>
if (x==2)
{
print "x is two!"
} else if (x==3) {
print "x is three!"
} else if (x>3) {
print "x is greater than three!"
} else {
x=2
print "x didn't used to be two, but it is now!"
}
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