do Statement
do
statement
while(expression);
The do keyword executes statement repeatedly until expression becomes false (0).
Example
// Example of the do-while statement
do
{
y = f( x );
x--;
} while ( x > 0 );
In this do-while statement, the two statements y = f( x ); and x--; are executed, regardless of the initial value of x. Then x > 0 is evaluated. If x is greater than 0, the statement body is executed again and x > 0 is reevaluated. The statement body is executed repeatedly as long as x remains greater than 0. Execution of the do-while statement terminates when x becomes 0 or negative. The body of the loop is executed at least once.