Not like
for
and
while
loops, they test the loop conditions at theloop header. In
Perl
the language
do...while
loop checks itscondition at the end of the loop.
The syntax format is as follows: Notice that the conditional expression appears at the end of the loop, so the If the condition is Execute the above program, and the output is as follows:
do...while
cycle vs.
while
loop is similar, but `` do…while``loop ensures that the loop is executed at least once. 5.23.1. Grammar #
do
{
statement(s);
}while( condition );
statement(s)
, it will be executed at least once before the conditionis tested.
true
control flow will jump back to the above
do
and then re-execute the
statement(s)
. This process is repeated over and over again until a given condition becomes
false
so far. 5.23.2. Flow chart #
Example #
#!/usr/bin/perl$a=10;# execute do...while loop do{printf"a
The value of is :$a\\n";$a=$a+1;}while($a<15);
The value of a is: 10
The value of a is: 11
The value of a is: 12
The value of a is: 13
The value of a is: 14