while

while

Perl

$n = 0;
while ($n < 10) {
    print $n++, "\n";              # 0 - 9
}
print $n, "\n\n";                  # 10

$n = 0;
print $n++, "\n" while ($n < 10);  # 0 - 9
print $n, "\n\n";                  # 10

$n = 0;
until ($n >= 10) {
    print $n++, "\n"               # 0 - 9
}
print $n, "\n\n";                  # 10

$n = 0;
print $n++, "\n" until ($n >= 10); # 0 - 9
print $n, "\n"                     # 10

Ruby

n = 0
while n < 10 do
    puts n                        # 0 - 9
    n += 1
end
puts n                            # 10
puts

n = 0
until n >= 10 do
    puts n                        # 0 - 9
    n += 1
end
puts n                            # 10

PHP

<?php
$n = 0;
while ($n < 10)
    echo $n++, "\n";              # 0 - 9
echo $n, "\n\n"                   # 10
?>

Python

n = 0
while n < 10:
    print n              # 0 - 9
    n += 1
print n                  # 10