You use iteration statements to force a program to execute
a statement repeatedly. The executed statement is called the loop
body. Loops execute until the value of a controlling
expression is 0. The controlling expression may be of any scalar
type.
C has several iteration statements: while, do-while,
and for. The
main difference between these statements is the point at which each
loop tests for the exit condition. Refer to the goto, continue,
and break statements
for ways to exit a loop without reaching its end or meeting loop
exit tests.
Syntax |
 |
iteration-statement ::=
while (expression) statement
do statement while (expression);
for ([expression1] ; [expression2]; [expression3]) statement |
Examples |
|
These three loops all accomplish the same thing (they assign
i to a[i]
for i from 0 to 4):
i = 0;
while (i < 5)
{
a[i] = i;
i++;
} |
i = 0;
do
{
a[i] = i;
i++;
} while (i < 5); |
for (i = 0; i < 5; i++)
{
a[i] = i;
} |
