Syntax of the while statement

Here is the syntax for the while statement:

while ( condition )
  statement 

Notes:

• The condition is a Boolean expression: something that evaluates to true or false.
• The condition can be complicated, using many relational operators and logical operators.
• The statement is a single statement. However it can be (and usually is) a block statement containing several other statements.
• The statement is sometimes called the loop body.

Since the statement can be a single statement or a block statement, a while statement looks like either choice in the table. Almost always, though, a while statement is used with a block.

The style of indenting used here leads to fewer errors than alternative styles. The statements controlled by the while are indented. The braces of the block are aligned with each other and with the while and each is put on its own line.

while ( condition )
  statement;

while ( condition )
{
  one or more statements
}