Next page | Contents page |

Loop statements (2) - for

Syntax:

for ( initialise ; test ; increment ) statement		

initialise and increment usually involve assignments. Both can be comma-separated lists of statements.

initialise (optional) sets initial conditions. It can include declaring variables, ie with their types - in that case the variables are local to the loop and no longer exist afterwards.

test is a boolean condition: the loop executes as long as it is true.

increment (optional) is executed after statement, each time round the loop.

Both semicolons must always be present, even if optional parts are omitted.

Example:

	for (int i = 0, j = 10; i < j; i++, j--)
	{
		if (3 * i > 2 * j)
		{
			System.out.println (i + "  " + j);
		}
	}		

In this example i and j are declared as part of the initialise section and so they are local variables, available in the loop but not afterwards.

Next page | Contents page |