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Form:

while(true/false){...}

The while loop is executed each time round so if the value to be tested is set here it will be reset every time round.

while( (x = getX()) != 0 )
{
...
}

If getX() returns an int then this loop will never finish.

do{...} while(true/false) 

Examples of valid do … while loops

do { break ; } while (true) ;