do-while Statement ¶The do loop is a variation of the while looping statement.
The do loop executes the body once and then repeats the
body as long as the condition is true. It looks like this:
do body while (condition)
Even if the condition is false at the start, the body
executes at least once (and only once, unless executing body
makes condition true). Contrast this with the corresponding
while statement:
while (condition)
body
This statement does not execute the body even once if the
condition is false to begin with. The following is an example of
a do statement:
{
i = 1
do {
print $0
i++
} while (i <= 10)
}
This program prints each input record 10 times. However, it isn’t a very
realistic example, because in this case an ordinary while would do
just as well. This situation reflects actual experience; only
occasionally is there a real use for a do statement.